Lock-Right™ Installation Manual
Contents
1. 2 Differential Assembly Background Information c ccsccccsscsssecsssesseccsssessseecsssesensecseees 3 Vehicle Final Installations bo Tire Diameters Preliminary 5 484 6 Testing Your Installation ccccssecsseseescsseseescseeseescesseeeeeeaeees Determination of Axle 6 Driving Your Vehicle cccccccccsecssscscsssssesscsssessssesesseesesseusseserss Differential Case Removal thick ring 6 Subsequent DisasseMbly c ccccccccsssccsccsssssseseescccsesesseseesseesenees Disassembly of Differential 8 Inspection Of the 4 9 Warranty Preparing Parts for 5 10 Assembly of the Parts Differential Case 15 Case Final Assembly Into 18 LOCK RIGHT Performance Locker Installation Manual Integral Carrier Axles C Clip and non C Clip Versions Typical of Spicer Jeep G M 10 12 bolt Ford 8 8 inch Toyota L C etc I2. Buyers out proper lube and correct amount will include the following language in a conspicuous place and in a conspicuous manner in a written agreement covering such sale safe operation and to maintain the unit warranty h 2 f A lled f f The manufacturer makes no warranties or representations express or implied by operation when changing a factory installed fastener for any rea of law or otherwise as to the merchantability or fitness for a particular purpose of the goods son it becomes the responsibility of the person making sold hereunder Buyer acknowledges that it alone has determined that the goods purchased the change to properly account for fastener grade thread hereunder will suitably meet the requirements of their intended use In no event will the t load tighteni t dth f manufacturer be liable for consequential incidental or other damages Even if the repair or engagement loaa tightening torque an e means replacement remedy shall be deemed to have failed of its essential purpose under Section torque retention 2 719 of the Uniform Commercial code the manufacturer shall have no liability to Buyer for consequential damages e Mounting bolts should be periodically checked to ensure that the unit is firmly anchored for proper operation Resellers Buyers agree to also include this entire document including the danger warnings and cautions above in a conspicuous place and in a conspicuous manner eThese i
3. a LOCK RIGHT this block is re used along with the original axles so that the original end play adjustment does not change How ever if the original axles are changed to different original type axles the block will continue to be used but the end play must be re adjusted see the shop manual for the procedure If the axle is changed to another type that does not need end play ad justment such as a one piece design the thrust block may be omitted In the Land Cruiser the block is never used A word about side gear thrust washers All differentials originally had a thrust washer under each side gear Thrust wash ers are large in diameter and between about 1 32 inch 031 or 0 76 mm and 1 16 inch 062 or 1 52 mm thick If either one or both are missing from the original differential obtain new one s before proceeding LOCK RIGHT is designed to be used with a correct thrust washer under each coupler and failure to use this washer is easy to observe during inspection and will void the warranty A word about C Clips Many integral carrier differen tials have the axle shafts retained by C Clips These are semi cir cular pieces of hardened steel similar to a washer with one side cut out that fit into a groove in the end of the axle shaft and into a pocket in the side gear The axle shaft is held in place by the pinion spider gear shaft The LOCK RIGHT is designed for many of these axles and their installation is covered in
4. this manual This type of axle is the easiest in which to install a LOCK RIGHT typically requiring about one hour for the procedure NOTE The parts shown in the various figures are typical and may not exactly depict your particular model LOCK RIGHT Installations Covered in This Manual Integral carrier axles Typical of these is Spicer Jeep 20 10 12 14 bolt Ford 7 5 inch and 8 8 inch Toyota Land Cruiser similar axles with and without C Clips Preliminary Steps The following steps are only a general guide to prelimi nary operations used for preparing your vehicle for LOCK RIGHT installation For detailed information refer to your shop manual In general the preliminary steps include a Blocking the vehicle putting transmission in neutral b Loosening the wheel lug nuts optional with C Clips and other axles c Jacking up the axle securely resting it on jack stands THRUST WASHER COUPLER DRIVER STOP PIN PINION BIAS SIDE GEAR SPACER SHAFT S SRPINGS BLOCK Figure 1 LOCK RIGHT Exploded View 5 DRIVER 5522 PARTS IN SOME MODELS COUPLER SIDE GEAR THRUST WASHER d Removing the tires Section 1 Removal of the Differential Case e Disconnecting the brake lines and emergency brake and Ring Gear Assembly From the Vehicle cables thick ring gear f Pulling out one or both axles a few inches Summary of steps in this section 1 Securely blo
5. 8 manual for the exact procedure 6 Finish the installation of any remaining parts by reversing the order of disassembly in general the axles back ing plates brake lines emergency brake cables and tires If your vehicle uses an axle shaft thrust block be sure that the correct axle shims are in place at the outer ends of the axle shafts In these designs there should be little or no end play Also note that in some designs the last 1 8 inch or so of the back ing plate installation may be a light press fit and the axle shaft may appear to be hitting something tap the outside end of the axle shaft and it should go in Assembly Inspection 1 Inspect your work Look for anything that is not cor rect Be sure that the drivers rotate back and forth smoothly stopping at the pinion shaft Use a light to see that the spacers and thrust block if used are in place and that the springs are working properly When the above installation steps are completed all the parts should be in exactly the same positions as they were when the installation began If the differential case has been removed from the vehicle the backlash and pre load settings should be unchanged from before and no further adjustments will be needed To be certain rock the ring gear back and forth to see if the backlash appears to be the same as it was prior to the installation If not it will need to be reset with a dial indicator as described in the shop manual Rotat
6. Clips are locat ed in a groove in the end of each axle shaft and are held in a pocket in the side gear by the pinion shaft Bump each tire inward slightly to free the clips they will fall out to free up the internal parts 4 For installations with the differential case in the ve hicle leave the ring gear side axle bolted in place pull out only the other axle shaft about two inches 5 Remove the spider gears side gears all washers and axle shaft thrust block if used in your assembly Inspection of the Parts NOTE These steps are important The LOCK RIGHT uti lizes your differential case side gear thrust washers and pinion shaft plus the axle shaft thrust block if used and they must be in excellent condition The spider gears and washers are not used If the following inspection shows that anything is bad buy new parts from your dealer 1 Thoroughly clean the differential case and wash maining parts with solvent then dry them 2 Inspect the pinion shaft Any noticeable grooves or galling may weaken it and can also adversely affect the operation of your new LOCK RIGHT If it is not in excellent condition obtain new 3 Inspect the side gear thrust washers They are im portant to the correct positioning of the LOCK RIGHT parts If they are excessively worn or are cracked obtain new ones If several thicknesses are offered try to obtain the same size as the old ones NOTE There should be TWO th
7. case and shims from the carrier as described in the shop manual some axle designs may require the use of a carrier spreader tool Be sure to put a small grind mark on each shim or tag them so that they can be replaced on the same side 5 Remove the differential bearing race from the side with one punch mark first Put a very small grind mark on the outside of it or use a tag Be sure that you can identify it for proper re assembly on the same side 6 Remove the other bearing race 7 Remove the ring gear from the case It may need to be tapped off with a brass mallet see the shop manual Mark it so that it can be re installed in the same rotational orientation as when removed 8 Proceed to Section 2 next for LOCK RIGHT Installa tion Section 2 Disassembly of the Differential Case with thin ring gear and C Clips in the vehicle also with thick ring gear case removed from vehicle Note If the axle assembly is a C Clip design or has a thin ring gear the differential case remains in the vehicle and the ring gear side axle shaft does not need to be disturbed it simply re mains bolted in place and the LOCK RIGHT installation is done by only partially removing the opposite axle shaft 1 Remove the pinion shaft retaining pin using a long punch In the vehicle the left bearing cap may need to be re moved for C Clip differentials only unscrew the bolt 2 Remove the pinion shaft 3 For C Clip differentials only The C
8. ck and jack up vehicle Determination of Axle Type 2 Pull out axle shafts by about six inches 3 Mark carrier and bearing caps 4 Observe ring gear backlash amount 5 Remove bearing caps 6 Remove differential case from carrier 7 Remove and mark bearing races 8 Remove ring gear 9 Install LOCK RIGHT 1 Remove the differential cover and drain the oil 2 Inspect to determine axle assembly type If itis C Clip design proceed directly to Section 2 on page 8 If not continue with step 3 next 3 Determine if the ring gear is thin enough to be able to pull the pinion spider gear shaft out past the teeth If so proceed directly to Section 2 on page 8 If not continue with Section 1 next 1 Perform the operations listed below and as de scribed in your shop manual that apply to your vehicle The axle shafts should be pulled out about six inches for differential case removal 2 Using a center punch mark both the carrier and bearing cap on the ring gear side with one punch mark each and on the other side with two marks The caps are not in terchangeable because each one is line bored with the carrier These marks are very important to correct re assembly 3 Rock the ring gear back and forth to get a feel for the amount of backlash present This amount of rotation will be re checked when the differential case is installed to determine if it has been done correctly 4 Remove the bearing caps and then the differen tial
9. coupler shoulder Rotate the drivers and couplers back and forth to be sure that they are not binding 8 Install the pinion shaft retaining pin If the pin is solid as opposed to a roll pin slightly deform the metal on the side of the hole to help hold it in place see the shop manual For C Clip Axles only Screw in and tighten the bolt 9 For differential cases out of the vehicle The case should still be on the bench after the preceding steps install the ring gear now and torque the bolts Proceed to the next section 17 Figure 9 Install pinion shaft then pin Assembly of Differential Case Into Vehicle thick ring gear differential case was removed from vehicle 1 Clean the axle housing interior cover mounting sur face and drain plug 2 Place the correct bearing races onto each end of the differential case ready to install 3 If shims are used locate them near the correct ends of the case ready to install 4 Install the differential case in the carrier as described in the shop manual Generally this will involve placing the dif ferential case and correctly located bearing races with one shim into the carrier and then tapping in the shim on the other side or pressing the case in if the shims are already mounted under the bearings In some designs a spreader for the housing may be required 5 Replace the bearing caps in their marked positions and torque the bolts to their correct value Consult the shop 1
10. driver Use the U shaped wire tool 5 Rotate the left tire and both drivers until the C Clip installation recess in the teeth of the right driver is pointing down 6 Tap the right tire inward to release the C Clip so that it falls down through the recess 7 Rotate the left tire to rotate both drivers and allow the C Clip to drop out of the case 8 Pull the right tire out about one inch 9 Push the spacers into the centers of the drivers 23 10 Remove the driver and spacer opposite the ring gear flange first and then remove the second driver 11 Remove the left C Clip 12 Remove the couplers Section 8 Technical Assistance If you have general questions please contact your local dealer for assistance If your questions are of a more technical nature you may call RICHMOND GEAR TechLine 1 for further information Section 9 Warranty Information The Warranty is contained in the Vehicle Owner s Man ual that is supplied with your new LOCK RIGHT Consult this manual for complete warranty information IMPORTANT If your differential case or thrust washers are excessively worn your new Lock Right Locker may not be able to operate as it was designed Therefore two easy measure ments must be made before final assembly to assure that your new locker will function properly To make these measurements proceed as follows 1 Remove the existing spider gears side gears and thrust washers from th
11. e differential case and thoroughly clean it 2 Install the Lock Right couplers with the existing thrust washers in each end of the case there 4 Install the pinion shaft carefully guide it past the spacers as it is being inserted through the holes in the case 5 Measure the gap between each spacer and the pinion shaft with a feeler gauge This gap should be between 005 inch and 020 inch with not more than an 008 inch difference between the two If your numbers are within the limits specified remove the parts and begin your installation If your numbers are not within these limits check the thrust washers and the differential case If they are excessively worn or are damaged they may need to be replaced before installing your new Lock Right Locker If you have any questions call PowerTrax Customer Service at 1 864 843 9275 8AM 6PM ET for further assistance 24 The following WARNING and CAUTION information is supplied to you for your protection and to provide you with many years of trouble free and safe opera tion of your Richmond Gear product Read ALL instructions prior to operating transmission and or ring and pinion Injury to personnel transmission or ring and pinion failure may be caused by improper installation maintenance or operation elt is dangerous to get under a jacked up vehicle The vehicle could slip off the jack and fall on you You could be crushed Never place any part of your body under a vehic
12. e the ring gear one revo lution to be sure that nothing is binding Your LOCK RIGHT installation should now be com plete As preliminary test only prior to the final test on the next page rotate the tires back and forth transmission out of gear and drive shaft free The drivers should randomly unlock and click as the tires move Note that the tires will NOT lock 19 together this easy unlocking characteristic is a unique feature of the LOCK RIGHT and is perfectly normal Watch to be sure that both sets of teeth engage and disengage If they do your installation has probably been done correctly and your LOCK RIGHT is ready for its final test described in Section 5 on page 21 Note that the clicking sound is much louder now than what you will hear during driving because the cover is off and no oil is present As an additional check to be sure that everything has been installed correctly use a small ruler vernier caliper or blade type feeler gauge The distance between the halves of the LOCK RIGHT that is between the two drivers should be about 5 32 inch 152 inch or 3 86 mm The tolerance limits are between 145 inch 3 68 mm and 170 inch 4 32 mm If this distance is much over 170 inch either the case is quite worn or the thrust washers are missing or are too thin and the problem should be corrected before proceeding further Vehicle Final Assembly When everything is correct clean the axle housing gas ket s
13. le that is on a jack Never start or run the engine while the vehicle is on a jack If you need to get under a raised vehicle take it to a service center where it can be raised on a lift Hot oil can cause severe burns Use extreme care when removing lubrication plugs and when working close to a unit that has been in operation IMPORTANT INFORMATION Please Read Carefully CAUTION Check lube level between scheduled lube changes to insure that proper lube level is maintained Inspect vent plug to insure it is clean and operating Inspect the tightness of mounting bolts misalignment of connecting shafts lube leak age excessive heating or any unusual noise or vibration personal injury may occur as a result of improperly performed mainte nance adjustments or repairs not attempt any of the maintenance checks or repairs described on the fol lowing pages if you are not fully familiar with these or other procedures with respect to the transmission or are uncertain as to how to proceed Have the necessary work done by a properly equipped and qualified workshop eAlways be extremely careful when working on the transmission Always follow commonly accepted safety practices and general common sense Never risk personal injury continued on next page CAUTION not operate the transmission or ring and pinion with In the event of the resale of any of the goods in whatever form Resellers
14. nstructions are not intended to cover all details in writing to instruct users on the safe usage of the product or variations in equipment nor provide for every possi ble contingency to be met in connection with selection This information should be read together with all other printed information sup installation operation and maintenance Should further plied by Richmond Gear information be desired or should particular problems arise which are not covered sufficiently for the Buyer s purpose the matter should be referred to Richmond Gear 26 NOTES lt gt RICHMOND AN AMERICAN LEGEND FOR OVER 20 YEARS
15. ntroduction Welcome to the growing family of LOCK RIGHT owners This manual will help you install your new LOCK RIGHT automatic 100 full locking differential When the installation is complete your vehicle will have extreme traction We trust that you will be pleased with its performance and thank you for your confidence in our products LOCK RIGHT installation simply involves disassembling and re assembling the differential case replacing a few parts in the process These instructions are detailed to the point that a person who is reasonably familar with automotive work can install a LOCK RIGHT into a C Clip integral carrier axle and into certain non C Clip variants in about one hour and into other integral car rier axles in about 2 1 2 hours please read them carefully before you start to be sure that you thoroughly understand them Do not attempt shortcuts unless you know exactly what you are doing These instructions also assume that you have the proper shop 2 manual for reference to instructions about axle shaft removal torque values settings clearances etc that apply to your par ticular vehicle Our manual is a general guide to operations but does not contain specific information for each vehicle Remember This instruction manual is provided for your convienience to assist you or your mechanic with the installation of your new LOCK RIGHT However the ultimate responsibility for the success of your installation and the subse
16. of the tires in the forward direction with your hand until it stops then hold it That side of the LOCK RIGHT is now locked 4 Rotate the other tire in the opposite reverse direc tion The LOCK RIGHT should click as the coupler attached to the axle rotates 5 Rotate the first tire in the reverse direction and hold it repeat step 3 rotating the other tire in the forward direction 6 Repeat steps 2 4 rotating and holding the second tire to lock the second side 21 Section 6 Driving Your Vehicle If the foregoing measurements and tests have been suc cessfully completed apply the emergency brake and remove the vehicle from the jack stands Your vehicle should now be ready to drive Carefully read and understand the driving information contained in the LOCK RIGHT Vehicle Owner s Manual Safe and effective use of your new LOCK RIGHT equipped vehicle depends on knowledgeable operation and this can only be done by un derstanding its characteristics before you start Be careful and have fun Section 7 Subsequent Disassembly If something is not correct now or if you need to disas semble your LOCK RIGHT in the future we will briefly describe the procedure here We will assume that the case has a thin ring gear and remains in the vehicle or that it has a thick ring gear and has been removed from the vehicle and is on the bench Non C Clip Axles 1 If the case will remain in the vehicle thin ring gear pull out
17. only the right axle shaft about two inches Otherwise remove the differential case from the vehicle and place it in the bench 2 Remove the pinion shaft retaining pin and the pin ion shaft 3 Rotate the drivers until one of the right window holes faces out Push under the spring with a small sharp point ed pick and pry the end up Push a small screwdriver or bent 22 piece of small wire a paper clip works well under the spring and pop the bottom out Push the shear pin out of the pin hole and into the window hole Repeat for the other three springs and pins 4 Position the case horizontally and push in the spac ers so that they are in the middle of the drivers If a thrust block is used push it into the right coupler splines 5 Remove the driver and spacer opposite the ring gear flange first and then remove the second driver 6 Remove the couplers C Clip Axles 1 Remove the pinion shaft retaining bolt and the pin ion shaft 2 Rotate the drivers until one of the right window holes faces out Push under the spring with a small sharp point ed pick and pry the end up Push a small screwdriver or bent piece of small wire a paper clip works well under the spring and pop the bottom out Push the pin out of the pin hole and into the window hole Repeat for the other three springs and pins 3 Move the right driver to the left touching the left driver 4 Move the right spacer to the left into the center of the left
18. quent proper operation of your vehicle rest with you the vehicle owner When your installation is complete you will have a vehicle with significantly increased capabilities For con tinued fun in the sun operate it in a safe and responsi ble manner Be sure to read and understand the driving in formation in the LOCK RIGHT Vehicle Owner s Manual Background Information The differential case is the round housing inside the rear axle assembly to which the ring gear is bolted and which contains the differential spider and side gear assembly It is installed in the differential carrier which is the housing that holds the case drive pinion gear bearings etc The carrier may be removable as part of a drop out unit or third member or it may be integral as a permanent part of the axle assembly mounted in the vehicle This manual covers the integral carrier design both C Clip and non C Clip versions The LOCK RIGHT is designed to fit into standard open differential cases only not into limited slip clutch pack type cases If your vehicle contains a limited slip unit you will need to purchase a standard open differential case thrust washers and pinion shaft before proceeding A word about axle shaft thrust blocks A few differen tials such as the Jeep AMC 20 and the older 19 tooth Spicer 44 axle use a thrust block between the inside ends of the axle shafts as a part of the end play adjustment When installing
19. r and pop the bottom into the window hole Figure 8 6 Push pins into opposite driver 15 Push on the bottom coils to be sure that the spring snaps in and is seated all the way Rotate the drivers and do the same proce dure for each of the other three pins and springs 4 Reach in through the recesses with your fingers and be sure that the spacers are pushed outward onto the couplers 5 Rotate the drivers so that the large recesses line up with the pinion shaft holes in the differential case 6 If an axle shaft thrust block is being used push it into the center of the assembly and line up the large hole with the pinion shaft holes If in the vehicle push the right axle shaft inward now into the coupler splines to move the block to the center 7 Carefully insert the pinion shaft into the hole and guide it through the drivers past the spacers and through the thrust block if used It should insert easily by hand If not tap it in being very careful not to get the inner end caught on some thing 7 Figure 8 Install spring assemblies holes Snap spring assembly into hole 16 Be sure to orient it so that its retaining pin hole will line up with the hole in the differential case Figure 9 If the pinion shaft will not insert or is hard to insert be sure that the correct thrust washers are being used and that the spacers are orient ed with the widest side opening fitting down over the
20. r coupler and washer 3 Install left C Clip C Clips only 4 Install left driver and spacer assembly 5 Install other driver non C Clip or 6 Install other C Clip C Clips only 10 Figure 2 Install shear pins and spacers 1 Install a coupler and washer assembly in the ring gear end of the differential case over the axle splines if in the vehicle See Figure 3 Note that the couplers in some models may have flats for clearance If an axle shaft thrust block is used place it in the center of the second coupler now if the installa tion is being done in the vehicle If not it may be installed later 2 Place the second coupler and washer assembly into the other end of the differential case Figure 3 3 For C Clip differentials only Place a C Clip with the ends pointing down into the ring gear side axle shaft end groove and pull the tire out sharply to seat the clip Figure 3 Then carefully push the other axle into the second coupler splines until the end of the axle shaft is even with the coupler surface Keep the coupler seated in the case Note The ring gear is removed for clarity Ordinarily the differential case is in the vehicle and the ring gear is in place 11 Figure 3 Install couplers and left C Clip if so equipped 4 Important Be sure to have the spacers correctly placed in the drivers before doing the following steps Pick up one of the driver and spacer assemblies Ori ent its teeth toward the
21. ring gear flange and hold it so that the flats if present will clear the sides of the case Place it on the teeth of the coupler and press it into the grease Figure 4 Reach into the center and push the spacer down onto the coupler shoul der and over the C Clip if so equipped 5 For non C Clip axles only repeat this step for the other driver and spacer assembly Figure 4 then proceed to Section 3 on page 13 6 For C Clip axles only follow the steps below to install the second C Clip and other driver a Make a tool with a piece of stiff wire such as from a coat hanger Bend it into a 4 shape about four inches wide at the bottom with one inch sides 12 Figure 4 Non C Clip axles Install drivers C Clip left b Place the other driver assembly in the differential case Push it to the left touching the other driver Figure 5 c Using the U shaped wire between the driver and coupler teeth push its spacer leftward into the center of the left driver to help hold it temporarily in place d Rotate both drivers with the left tire until the C Clip installation recess in the right driver teeth is pointing out e Tap the right tire inward until the bottom of the groove in the end of the axle shaft is even with the surface of the coupler Keep the coupler seated in the case f Slide the other C Clip through the recess in the teeth and into the groove in the axle shaft end Figure 5 g Pull the right tire ou
22. rust washers of about equal thickness one under each side gear 4 Inspect the thrust block if used Be sure that the ends are smooth and not galled 5 Inspect the case for any chips cracks or similar damage Also inspect the bearings if the case is out of the vehicle If the case or bearings look bad replace them However if you do remember that the shims no longer will be correct the ring and pinion backlash and bearings pre load will need to be reset with a dial indicator as described in the shop manual LOCK RIGHT Installation Preparing the Parts for Assembly 1 Coat the teeth of the couplers and drivers the large center holes of the drivers and both sides of the thrust washers with medium grease Also place a little grease in each of the two window holes in each driver The grease will help hold things in place and assist with functioning until the gear oil circulates 2 Place a shear pin into each window hole It should be about flush Figure 2 3 Place spacer into the center of each driver wide end toward the teeth if not symmetrical Figure 2 4 Press a thrust washer with grease added onto the back of each coupler 5 Insert a small spring into each of the large springs and add a little grease to the coils to hold them together Set them aside Assembly of the LOCK RIGHT Parts into the Differential Case Summary of steps in this section 1 Install Ring gear side coupler and washer 2 Install othe
23. t sharply to seat the C Clip 13 Figure 5 C Clip axles install C Clip and right driver h Rotate the right tire 1 4 turn until the C Clip ends are pointing downward so that it will not fall off i Rotate the eft tire to position both drivers so that the large semi circular recess in the right driver is facing out j Push the right driver to the right and into the grease in the coupler teeth k Through the semi circular recess push the right spacer to the right over the C Clip and axle shaft end Section 3 Differential Case Assembly Completion All Models NOTE These steps are for the differential case that has been removed from the vehicle and is on the bench as well as for those remaining in the vehicle Summary of steps in this section a Rotate drivers align holes b Push shear pin into other driver 14 c Install spring assembly d Repeat for other pins and springs e Push spacers outward f Install pinion shaft and retaining pin 1 Rotate the right driver until one of its long window holes containing a pin faces out and rotate the other driver until one of its empty pin holes lines up with the first window hole 2 Push the pin out of the window hole and into the pin hole in the opposite driver with a small pointed tool Figure 6 3 Place one end of a spring assembly small spring in side the large one into the window hole behind the pin Figure 7 Compress it with a small screwdrive
24. urface and install the cover using a gasket and or sealant as appropriate and torque the bolts Add gear oil Note that we suggest using medi um to heavy oils as recommended by the manufacturer unless the vehicle will be used in very cold weather Thicker oil such as 85 140 reduces the clicking noise sometimes heard during tight turns and provides adequate lubrication when the assem bly becomes hot Also see the section in the Vehicle Operator s Manual regarding temperature 20 Section 4 Tire Diameters To help assure a long life for your new LOCK RIGHT tire diameters should be as nearly equal as possible DO NOT change the inflation pressure to vary the rolling radius of the tire This practice can be dangerous if one of the tires is under inflated producing excess heat faster tire wear and more difficult vehi cle control The best way to equalize the rotation is to measure the circumference of all the tires including the spare Choose ones that are within about 3 8 inch or less of each other do not change from side to side if they are radials If one tire is much more worn than the other one they both should be replaced for safety reasons Section 5 Testing Your Installation 1 Be sure that the vehicle is safely blocked Leave the axle assembly on the jack stands with both tires free to rotate and the emergency brake off 2 Put the transmission and transfer case in gear to lock the drive shaft 3 Rotate one
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