Installation Instructions - B and M Racing and Performance
Contents
1. Figure 1 Valve Body amp Trans I D 4 which connectors go to which solenoid See Fig 1 Pay particular attention to the location of the cable clamps and dipstick stop bracket Notice how the connectors and wires are colored Remove connectors from pressure switch assembly and solenoids then tie the wires up out of the way STEP 4 Remove all except the cen ter valve body bolt Pull the lube pipe out of the case pulling it out first at the front then at the rear When re moving the pressure switch be sure to recover all 5 switch assembly O ring seals as it is removed Hold the valve body firmly with one hand and remove the remaining bolt slowly No tice how the Manual Valve is engaged to the detent lever as you remove the valve body from case Caution There are eight 8 check balls in the case above the valve body along with sev eral pints of oil export units and some early models have nine 9 check balls Have your drain pan ready to catch the oil and check balls Save all the check balls in a secure place where they won t get lost STEP 5 Remove the 6 screws hold ing the accumulator housing to the valve body See Fig 7 Be careful to keep the 2 or 3 accumulator springs located inside the housing aligned with their respective bores STEP 6 Remove all of the old gasket material stuck to the Case flange Oil Pan Vavle Body Spacer Plate and Ac cumulator Housing MODIFICATIONS Pressure Regulator2. i L CA Pressure Switch 9 ir Ct Si sAssemb Bore AN e y M l RO ONT e e TA Detent Lever Pin a f Manual Valve Dr D Early model units used o rings in the pressure switch assembly Make sure to recover them during disassembly Dip Stick guesses i ee Stop i g When installing the valve N li l 3 body make sure ALL of the screws have been installed in the valve body Lube Pipe finger tight BEFORE beginning to tighten and Se A torque the bolts C f 3 Your Valve Body installation may appear slightly different than this one Reinstall the components as they were originally on your unit EE E Accumulator Housing Bolts 1991 1993 1 M6 x 100mm x 8mm Hex toe ce oe oe ee oe 5 M6 x 65mm x 8mm Hex Valve Body Bolts se ae M 1994 1996 6 M6 x 55mm x 8mm Hex Py an 6 M6 x 65mm x 8mm Hex 1 M6 x 35mm x 10mm Hex 21 M6 x 55mm x 10mm Hex BC Model will vary my TT iy w iW wY aie _ _ 4L80E Transmission a 6 SE Model Year BE ib cul Calendar Year i i Julian Date 1 f To fo Hmm Hmn f E
3. Installation Instructions Part Number 70376 1991 GM 4L80E Transpak Kit 2012 B amp M Racing and Performance Products Thank you for choosing B amp M The per formance company with over 50 years experience designing and manufac turing quality high performance auto motive driveline components Before proceeding with the installa tion please read all of the B amp M 4L80E Transpak Kit installation instructions so you will be familiar with the series of steps required to install this kit For other service information on your 4L80E transmission consult the ap propriate factory service manual for your vehicle Important Note Since mid 1992 pro duction the 4L80E has been as sembled with a heavy duty reusable oil pan gasket If your pan gasket is damaged or you have a 1991 or early 92 transmission you will have to pur chase a replacement oil pan gasket at your parts supplier An Oil Pan Gas ket IS NOT supplied with this kit The B amp M 4L80E Transpak Kit me chanically recalibrates your transmis sion to produce firm positive shifts this helps reduce clutch pack heat build up and improves transmission durability This kit does not change or modify shift point RPM in any range All transmis sion shift point RPM and pressure con trol functions remain under full PCM Powertrain Control Module control as they were originally No recalibration kit can fix an already ailing transmission If your 4L80E is slipping
4. STEP 7 Heavy Duty and High Per formance Street levels Remove the snap ring at the end of the pressure regulator bore See Fig 2 Use a screwdriver to push against the spring loaded Boost Valve sleeve while removing the retaining ring Re move Boost Valve Sleeve and Valve Pressure Regulator Spring and the Pressure Regulator Valve Reassemble the pressure regulator assembly in re verse order using the supplied RED Pressure Regulator Spring Boost Valve Boost Sleeve and Retaining Ring Important Early model 4L80E 1991 early 1992 require the Boost Valve and OEM pressure regulator valve to be modified Follow Sonnax Instructions that are provided to make the required modifications Do not in termix early and late Pressure Regu lator Valves Booster Valve or Sleeve The provided Balance Oil Plug should only be installed when the transmis sion is out of the vehicle because the pump assembly needs to be out of the unit It is installed on the backside of the Pressure Regulator Valve refer to the Sonnax instructions provided Make sure the retaining ring is fully seated in its groove when assembled If the retaining ring is not fully seated in its groove the pressure regulator assem bly will blow out of its bore when the engine is started resulting in NO LINE pressure Spacer Plate STEP 8 Heavy Duty and High Per formance Street levels Drill the orifices as indicated See Fig ure 3 with the supplied drill bits Be
5. careful to use the specified size drill and only drill the holes indicated for the Perfomance Level you have cho sen For best results first use an in delible pen to mark the holes to be drilled on the spacer plate and then double check your marks against Fig ure 3 Drill the smaller hole sizes first If you incorrectly drill your spacer plate you can obtain one from your GM Parts Department B amp M does not stock 4L80E Spacer Plates Be sure to take the build Year and Model infor mation See Fig 1 located on the tag on the right hand side of the transmis sion when ordering parts for your 4L80E Reassembly STEP 9 Replace the Pressure Con trol Solenoid PCS Filter and Shift So lenoid Feed SSF Filter See Fig 4 in the Valve Body with the new filters supplied in the kit Coat the O rings on the filters with clean ATF prior to installation The PCS Filter is removed by pulling it straight up out of the Valve body Remove the SSF filter by first removing the Filter Bore Plug Retain ing Pin and then the Manual Valve from its bore Very carefully insert an 8 long 3 8 drive extension into the Manual Valve bore and gently push the SSF filter out of its bore Reassemble both filters in reverse order of disas sembly Remove the TCC Solenoid Screen from the case See Fig 8 and replace it with the new filter from kit STEP 10 Apply a few dabs of Petro leum Jelly to both sides of the CLEAN drilled and deburred Space
6. 8 Install the new oil filter with seal provided in kit See Fig 1 into the case 1991 1993 Accumulator Housing 4th Accumulator Spacer HD 3 8 RED HPS 1 2 GREEN 3rd Accumulator Piston ind BLUE 3rd Accumulator Spring 4th Accumulator Spring amp Piston Figure 6 Accumulator Assembly 7 Figure 5 Spacer Plate Gaskets Accumulator Housing Gasket Spacer Plate Case Gasket STEP 19 DOUBLE CHECK THE FOL LOWING 1 Manual Valve Body is properly en gaged with pin on detent lever 2 All bolts are installed and torqued 3 Wiring harness connectors are en gaged to switch assembly and sole noids 4 Pressure Regulator Retaining Ring is fully seated in its groove STEP 20 Coat the Oil Filter pickup tube with clean ATF then push the tube into the filter seal in the case Install the Oil Pan and Gasket then torque the seventeen 17 bolts to 24 Nm 18 lb ft Fill transmission with ATF to the full mark on dip stick You will need about 6 to 7 quarts Dexron lll i mem 3rd Accumulator Piston BLUE 3rd Accumulator Spring is fine for Heavy Duty Level applica tions however we recommend B amp M Trick Shift MATF for High Performance Street level applications With the vehicle still off the ground start the enging and shift the trans mission through all gears Check for leaks around oil pan flange and drain plug Place selector in neutral and check the fluid level Turn engine off and th
7. Ratchet Wrench Small Retaining Ring Petrol Jell etroleum Jelly Socket 8mm amp 10mm Gasket Scraper Vaseline T27 Torx Driver Hammer Needle Nose Pliers fe e aa Wrench 8mm amp 10mm factory We have designed this kit as an easy way to overcome the less de sirable features of the factory cali brated imperceptible shifts With this kit you can set the shifting character istics of your 4L80E to one of two lev els of performance Heavy Duty or High Performance Street Heavy Duty level produces a solid noticeably firm shift when compared to the stock shift feel High Performance Street level pro duces a slightly quicker and more ag gressive shift compared to Heavy Duty level After installing the B amp M Transpak Kit the actual shift feel you get will de pend on the factory PCM calibration Automatic Transmission Fluid ATF temperature and the type of ATF you have used As ATF temperature in creases it becomes thinner less vis cous which allows the fluid to flow faster through small orifices thereby producing faster shift rates In addition to the effects of temperature each type of ATF B amp M Trick Shift Dexron Ill Type F etc has a spe cific characteristic friction property This characteristic friction property is one of the variables that determines shift feel and clutch torque capacity Dexron type ATF s were formulated to produce smooth impercept
8. agnostic scanner to turn them off after the mal function which set the DTC has been repaired If electrical power to the transmission is cut or the PCM fails the 4L80E will operate in limp home mode If this happens you will only have Reverse and Drive 2 range available Before installing your Shift Improver Kit there are several other B amp M products you may wish to consider and are available at your B amp M dealer TRICK SHIFT MPERFORMANCE ATF The industry s only real perfor mance ATF A specially blended oil formulated with foam inhibitors ex treme pressure agents and shift im provers this fluid assures protection while delivering the fastest possible shifts You literally Pour in perfor mance TRANSMISSION OIL COOLER We feel that it is very important that every vehicle used in heavy duty or high performance application should have an auxiliary oil cooler Excessive heat is the primary cause of transmission failures and an auxiliary oil cooler is an inexpensive safeguard against over heating and failure B amp M offers a wide range of transmission coolers to suit every need DRAIN PLUG KIT P N 80250 1991 and early 1992 model 4L80E transmission oil pans do not come from the factory equipped with drain plugs The B amp M Drain plug kit is inexpensive and easy to install It eliminates the mess when changing fluid or on pan removal TEMPERATURE GAUGE KIT P N 80212 Most transmis
9. e check the marked locations against the above illustration Drill the smaller orifice sizes first Drilling the orifices larger than specified will result in unpredictable shift characteristics and possible transmission damage reinstall the piston STEP 13 Heavy Duty and High Per formance Street levels Replace the stock 3rd Accumulator Spring with the BLUE 3rd Accumulator Spring included in the kit See Fig 6 STEP 14 Stick the Accumulator gas ket in place on the spacer plate with petroleum jelly Place the accumula tor springs and housing onto valve body Install six 6 M6 x 65mm Late model of five 5 M6 x 65mm and one 1 M9 x 100mm early model bolts and turn them down evenly Make sure all of the Spacer Plate and Gasket holes are lined up with the Valve Body holes then Figure 3 Spacer Plate Modification torque the Accumulator Housing bolts to 11 Nm 8 lb ft STEP 15 Check Balls If the trans mission is in the vehicle it is easiest to place the Check Balls See Fig 7 in the appropriate positions on the Spacer Plate and then install the Valve Body If the transmission is on the bench then placing the Check Balls in the case cavities See Fig 8 is the correct placement method Use a dab of Petroleum Jelly to hold the Check Balls in place Most transmissions will have eight 8 Check Balls al though export models and some early models have nine 9 Only eight 8 6 Check Ball positions are used with th
10. e vehicles Shift feel is firm and positive 2 High Performance Street level Dual purpose performance vehicles High Performance Street level pro duces the firmest shift feel DISASSEMBLY STEP 1 Position your drain pan un der the transmission to catch the ATF Remove oil pan by first removing rear pan bolts then work towards the front Loosen but do not remove the three front bolts If the pan sticks to the gasket insert a flat screwdriver be tween the pan and case and pry down gently to break pan loose Now slowly back out the front three bolts to per mit draining the ATF Remove pan gas ket and inspect for damage The Oil Pan Gasket is reusable if not dam aged except on 1991 and early 92 transmissions An Oil Pan Gasket IS NOT included with this kit If your gasket is damaged ypu will have to purchase one at your parts supplier STEP 2 Remove the oil filter from case by gripping it firmly and pulling it straight out away from the case In spect the filter pickup tube seal that is pressed into the pump housing See Fig 1 Ifthe seal and filter appear to be in good condition they may be re used otherwise both the seal and fil ter should be replaced STEP 3 There are several different wir ing harness configurations used on the 4L80E Before proceeding further make a sketch and some notes de scribing your particular unit recording 2 Oil Filter Pickup Tube Seal Detent Spring
11. en lower vehicle STEP 21 Test drive vehicle and re check for leaks while transmission is hot Check fluid level again adjusting level as required 1991 1993 Accumulator Housing shown Use petroleum jelly to hold the Check Balls in place DO NOT use grease 2 This Check Ball position is not used Install Check Balls EITHER on Spacer plate ENS AS 2 This Check IA Ball position is et e not used Pit A DL TCG Filter shown Front Servo Piston i i and Spring shown pulled out of its bore removed from bore g ST 4 Figure 8 TCC Filter and Case Check Ball Locations ERROR CONDITION High or Low Oil Pressure Harsh Soft Shifts Inconsistent or No Shifts No or Slips in 1st Gear No or Slipping 2 3 Shift No or Slipping 3 4 Shift No or Slipping Reverse No TCC Apply WHERE TO LOOK Oil Pump Oil Filter Wire loom Valve Body Assembly Pressure Control Solenoid Valve Body Assembly Oil Pump Accumulator Assembly Valve Body Assembly External Linkage Wire loom Low Oil Pressure Valve Body Assembly Valve Body Assembly Valve Body Assembly Valve Body Assembly Oil Pump External Linkage TCC Solenoid FOR CAUSE Pressure Regulator Valve Stuck P R Retainnig Ring not fully seated in groove Cracks in Filter Pickup Tube Pickup Tube Seal Damaged Wrong grease used on reassembly clogged solenoid filter Electrical connectors not fully engaged Spacer Plate
12. ible shifts while Type F or B amp M Trick Shift ATF with their higher friction properties results in firmer shift qual ity than Dexron Ill type ATF Both DEXRON III and B amp M Trick Shift ATF s are suitable for use in your 4L80E transmission For maximum performance and positive shift feel we 2 recommend B amp M Trick Shift M ATF SPECIAL INSTRUCTIONS Choose a clean dirt and dust free place to work on your 4L80E Dirt loose threads from rags and pieces of old gaskets can become lodged in valve bores and or separator plate ori fices and cause the transmission to malfunction If you do not have a sol vent cleaning setup available get sev eral cans of WD40 to clean your parts Warning Almost all cleaning solvents pose a threat of fumes and or fire Make sure to use cleaning solvents only in a well ventilated location away from any source of ignition such as open flames sparks hot water heat ers etc Be careful with the internal and exter nal wiring harness Wiring and or con nectors are easily damaged and diffi cult to troubleshoot if they are dam aged VERY IMPORTANT Use petroleum jelly to hold checkballs and gaskets in place during installa tion DO NOT use any kind of wheel bearing grease to hold checkballs in place these greases do not melt or mix readily with ATF and can block shift and pressure control solenoid feed cir cuit filters and orifices causing erratic shifts and potentia
13. is kit regardless if you originall had nine 9 Check Balls or eight 8 STEP 16 Make sure the Front Servo See Fig 8 is correctly installed if it was removed or fell out of its bore while the Valve Body was removed Wiping the bore dry and then coating the pis ton with petroleum jelly will usually help to hold the Servo Piston up in the case during Valve Body installation STEP 17 Make sure the Spacer Plate gaskets are properly positioned and the Check Balls are in place Carefully as semble the Valve Body to Case while You may have to loosen screw and rotate the Shift Solenoid to remove the SSF Filter ar Sooo babika ai s ae a i tay e SSF Filter Filter Bore Plug Plug Retaining Pin Figure 4 PCS and SSF Filters o 4th Accumulator Spacer HD 3 8 WHITE HPS 1 2 ORANGE TS Compensator Piston 4th Accumulator Spring amp Piston Valve Body To Spacer Plate Gasket guiding the Detent Lever Pin into the Manual Valve groove Push the Valve Body firmly against the Case and install one 1 screw finger tight in the center of the Valve Body to hold it in place In stall the Pressure Switch Assembly with six 6 M6 x 55mm x 8mm Hex head screws Install the Lube Tube remain ing clips and Dip Stick Stop When all of the screws have been installed torque them to 11 Nm 8 Ib ft starting in the center and working circularly outward Attach wire loom electrical connec tors STEP 1
14. lly serious transmis sion damage because of low line pres sure CAUTIONS ABOUT PCM The MIL Malfunction Indicator Light or Check Engine Light may be illumi nated turned ON if the vehicle is started and any of the transmission electrical connectors are disconnected or has wires that are broken or have been pinched and or shorted The MIL is programmed to illuminate whenever a system engine or transmission component malfunctions and at the same time a DTC Diagnostic Trouble Code is set in the PCM You may have to refer to your owners manual a GM service manual or visit a GM dealer to determine the source of the malfunction s that cause d any DTC codes to be set and the required rem edy Make sure your engine is in good tune and any problems related to set trouble codes are repaired BEFORE attempting to install your B amp M Transpak Kit Do Not attempt to jumper the Data Link connector to read a DTC from the PCM in your vehicle until you have checked your owners manual GM service manual or verified with your GM dealer that the particular PCM in your vehicle allows jumpering the data link Jumpering the data link connector to read DTC s is not possible on any 1996 or later OBD II vehicle and can dam age the PCM and result in a very ex pensive repair bill Except for some 1991 to 1995 PCM s all others will re quire the use of a diagnostic scanner to read Some DTC codes are hard codes and may require a di
15. oost valve and the pressure regulator valve see illustration For newer OEM pres sure regulator valve designs no alterations are required High line pressure will result from using the late design boost with an early unmodified pressure regulator valve Sonnax Boost Valve OEM Pressure Regulator Valve PAV Before Retrofit 1989 1991 Pressure Regular Valve Design Grind Sonnax boost valve back to step fora finished length of 475 484 Grind OEM PRV to fintahed length of 635 620 After Retrofit 1991 Later Pressure Regulator Valve Design No E 7 modifications required P gt 34200 D3K Rev A 34200 09K 12 02 05 Eni Mia Fa eset Me 2 600 843 2600 802 463 9722 F 802 463 4059 www sonnax com info sonnax com 2005 DESIGNED TO SAVE NOTE Complement your B amp M Transpak Kit with some of the following products Check the B amp M website at www bmracing com for various options B amp M Shift Plus 2 B amp M Remote TPS B amp M Drain Plug Kit Transmission Controller Must be used with 120001 80250 120001 120002 Cast Aluminum Deep Pan B amp M Transmission Oil Cooler B amp M Trick Shift Adds 3 qt 70264 SuperCooler For Pre 2000 vehicles 70295 70297 Hi Tek Cooler 80286 For 4L80E 1993 1998 Technical Service A highly trained technical service department is maintained by B amp M Racing and Performance to answer yo
16. or Gaskets misassembled or damaged Check Balls omitted or misassembled Valve Body or Accumulator Housing bolts loose Stuck ON Wrong holes drilled is Spacer Plate Spacer Plate or gaskets misassembled or damaged Check Balls omitted or misassembled Pressure Regulator Valve Stuck Wrong Spring or Spacer installed Damaged or missing Accumulator Housing gasket Accumulator Housing bolts loose Spacer Plate or gaskets misassembled or damaged Pressure Switch Assembly connector not fully engaged Pressure Swith Assembly Valve Body bolts loose Manual Shift Lever Linkage misadjusted Electrical connectors not fully engaged See above Spacer Plate or gaskets misassembled or damaged Solenoid disconnected or damaged Spacer Plate or gaskets misassembled or damaged Spacer Plate or gaskets misassembled or damaged Solenoid disconnected or damaged Spacer Plate or gaskets misassembled or damaged P R Retaining Ring not fully seated in groove Manual Shift Lever Linkage Misadjusted Solenoid disconnected or wiring damaged Instruction Data Sheet Factory Style Reverse 34200 03K 1 Boost Valve Boost Sleeve 1 Balance Plug amp O Ring Torque Signal Orifice EPC Reverse Boost Orifice Notes 1 Kit includes instructions to retrofit parts cating back to 69 2 Wet Air Tests can be done using either the reverse boost onfice or the t
17. orque signal orifice for this particular application Balance Oil Plug w O Fing Reverse Boost Sleeve Wet Air Test To test for a worn reverse boost sleeve and valve assembly perform a Wet Air Test with the pump halves still torqued together Put a small amount of oil into either the reverse boost or torque signal orifice Force low air pressure into the orifice If oil comes out of the other orifice there is leakage across the reverse boost torque signal circuit If there is a excessive leakage the sleeve I D is worn pump bore is leaking around the sleeve or the pump is not flat Discard both the OEM sleeve and valve and replace with Sonnax kit 34200 03K It is a good idea to perform the Wet Air Test again after installing the Sonnax kit Continued leakage after replacing the boost valve sleeve with o ring design indicates cross leakage between the pump halves Replace or resurface the pump halves to eliminate the remaining leakage Reverse Boost Orifice Torque Signal Orifice No leakage shouid be visible iai i e ia 34200 08K Rev A 34200 03K 12 02 05 TO SAVE 2005 600 843 2600 802 463 9722 F 802 463 4059 www sonnax com info sonnax com 10 AR MED 4 Factory Style Reverse Boost Valve amp Sleeve PART NUMBER 34200 03K Balance Oil Plug Instructions 1 Remove the balance oil plug last after disassembly of pump halves and pressure regulator valve 2 Remove the roll pin and drive the plug out
18. overheating shifting irregularly or making noise you should have it repaired before or in conjunction with the installation of your B amp M 4L80E Shift Improver Kit GENERAL 4L80E INFORMATION B amp M s 4L80E Transpak Kit was de signed to provide firm positive shift quality and improve transmission du rability in original vehicle installations especially those with moderate engine power improvements This kit was not designed for and is not suitable for all out racing applications Your 4L80E Transmission is controlled by the PCM which has full control of the 4L80E s operation All of the pa rameters that control fluid pressures shift point RPM and TCC Torque Con verter Clutch lockup speed have been preprogramed into the PCM at the Gasket Valve Body to Spacer Plate 1 2 L x 51 4 ID orange Spacer TCC Solenoid Filter Gasket Case to Spacer Plate 1 2 L x 5 16 ID green Spacer Press Regulator red amp a Parts in Kit Gasket Accumulator Housing 3 8 L x 1 4 ID white Oil Filter with e Drill 5 64 3 32 32 Solenoid Filter Press Regulator Retaining Ring 3 8 X 5 16 ID red Spacer Shifter Press Control Solenoid Filter Boost Valve Kit Printed in the U S A 9500865 00 Fine Cut Flat File Flat Screwdriver Required Tools Funnel Indelible Marking Pen Pliers Extension 2 amp 8 3 8
19. r Plate then stick the Spacer Plate Gaskets See 3 Fig 5 onto the appropriate sides of the plate and line up the holes Place the Spacer Plate on the Valve Body and insert several Valve Body Screws to help line up with the holes Accumulators STEP 11 Heavy Duty Level Only Remove the 4th Accumulator piston from its bore See Fig 6 Install the 3 8 long WHITE or RED spacer over the piston pin and reinstall the piston STEP 12 High performance Street Level Only Remove the 4th Accumu lator piston from its bore See Fig 6 Install the 1 2 long ORANGE or GREEN spacer over the piston pin and Pressure Regulator New Retaining Ring Reassemble the Pressure Regulator in this order Figure 2 Pressure Regulator fo HD Heavy Duty Level A 1 078 5 64 O O Ea O r HD 094 3 32 Cc ams N i oO i NPs 094 32 O oe J Q D O o O 9 O 0O 70 S O HD amp HPS C_ 094 3 32 E O U 078 5 64 Q A010 0 HPS 6 ae O O 20D HD amp HPS 116 32 O HPS High Performance Street Level There were 3 Spacer Plate designs used in the 4L80E from 1991 to 1996 The outline and some features on your Spacer Plate may appear slightly different when compared to the illustration The drilled orifice locations however are the same for all 1991 through 1996 versions Using an indelible pen first mark the orifices to be drilled on your spacer plate and then doubl
20. sion and con verter failures can be traced directly to excessive heat The B amp M transmis sion temperature gauge can save you a costly repair bill by warning you of an overheated transmission The B amp M temperature gauge comes with all nec essary hardware and is easy to install PREPARATION FOR KIT INSTALLATION Automatic transmissions operate at temperatures in the range of 150 and 250 Fahrenheit We recommend the vehicle be allowed to cool for several hours before disassembly to avoid burns from hot oil and parts The ve hicle should be raised so there is at least 2 feet ground clearance for ease of installation and safety MAKE SURE THE VEHICLE IS RIG IDLY AND SECURELY SUPPORTED 3 JACK STANDS WHEEL RAMPS OR AHOIST WORK BEST DO NOT USE JACKS ALONE Have an oil drain pan ready to catch oil and a tray on which to put small parts so they won t get lost It can never be said enough Make sure you have a clean dust free place to work Burrs and dirt are the number one enemies of an automatic trans mission Contamination in the valve body or pressure regulator valve train can result in serious transmission dam age and un predictable operation Transmission components are preci sion fit Work slowly and do not force any parts This kit contains all parts necessary to obtain two different shift feel levels of performance depending on the in tended use 1 Heavy Duty level Towing camp ers and 4 wheel driv
21. ur technical questions provide additional product information and offer various recommendations Technical service calls correspondence and warranty questions should be directed to the following address B amp M Racing and Performance 1500 Overland Ct West Sacramento CA 95691 Phone 808 544 4761 Monday Thursday 6AM to 12PM AND 1PM to 5PM PST Friday 6AM to 130PM
22. ward from the pressure regulator bore 3 Reinstall the end plug after the pressure regulator valve This procedure will prevent the plug from being installed too far into the larger bore Bore Preparation Instructions On o ring designed parts Sharp leading edges or casting surfaces must be deburred with a file and or a new ScotchBrite pad or 320 grit emery cloth The areas that usually create a concern are the balance oil plug roll pin cross holes the boost sleeve entry near the snap ring groove and the sleeves entry across the oval opening in the pump casting 1996 amp Earlier vs 1997 amp Later OEM boost valve designs Starting in 1997 the larger of the two boost valve diameters was decreased from 855 to 830 A corresponding diameter change is also found in the mating boost sleeve 1997 amp later OEM boost valves sleeves can be identified by a groove machined in the end of the sieeve The design change was made to seduce the maximunr reverse pressure by approximately 40 50 psi 1996 amp earlier boost valves can be replaced with the Sonnax design as long as the valve and sleeve are both replaced 1989 1991 Retrofit Instructions Between 1989 and 1991 the OEM pressure regulator valve and boost valve used a different design The pressure regulator valve was longer and the boost valve shorter The Sonnax boost valve can be modified for use with 1989 1991 OEM pressure regulator valves The retrofit involves shortening both the Sonnax b
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