Converter Lock-Up Control - B and M Racing and Performance
Contents
1. Installation Instructions Converter Lock Up Control TH700 R4 4L60 200 4R Part Number 70248 2008 2003 2001 1994 by B amp M Racing and Performance Products NOTE This kit is designed for trans missions equipped with an original equipment electronic speed sensor This kit does not work with electroni cally controlled transmissions or transaxles 4L60E 4L80E 4T60E 4T80E etc Use kit P N 70244 for transmissions equipped with a me chanically driven speedometer cable INTRODUCTION Please read the instruction sheet thor oughly before attempting to install your B amp M Converter Lock Up Control B amp M s Converter Lock Up Control provides driver control of the speed where converter clutch lock up takes place This dash mounted electronic control module has a dial to adjust lock up speed a two color LED Light Emitting Diode that indicates the lock up clutch status and a power on off button The Converter Lock Up Con trol module receives a signal from the transmission mounted speed sensor This signal along with the dial setting determines the precise speed at which to activate the lock up clutch solenoid Whenever the ignition is on and power button is engaged but the vehicle is stopped or moving slowly the LED is RED lock up clutch off When the vehicle reaches the speed preset by the dial on the Converter Lock Up Control module the LED turns GREEN and power is available to the Printed in the U S A2. lock up clutch solenoid This will acti vate the solenoid and cause the con verter clutch to lock up Once the trans mission has shifted beyond first gear and the solenoid is activated lock up will occur at any speed within the range of the Lock Up Control B amp M s Con verter Lock Up Control will not cure a defective converter clutch however if the clutch is not defective the B amp M Converter Lock Up Control will lock it at the preset speed WARNING When using B amp M s Con verter Lock Up Control with any four speed overdrive transmission we rec ommend thatlock up speed not be set higher than 45 M P H Operation in fourth gear Overdrive without the converter clutch locked up can result in transmission and engine overheat ing PREINSTALLATION Before installing your B amp M Converter Lock Up Control we recommend that you perform a few simple transmis sion performance checks and make sure you have certain tools and equip ment on hand to assist in the installa tion LOCK UP CLUTCH OPERATION Operate vehicle with range selector in third gear Drive position Choose an area where you will not exceed the Not legal for sale or use on pollution controlled motor vehicles local speed limit Verify proper opera tion of lock up clutch and transmis sion Accelerate the vehicle at low speed until it shifts into third gear Lock up clutch operation in stock ve hicles can usually be checked by operating the v
3. ack wires Lock up engagement speed is adjusted while operating the vehicle Operate the vehicle at the speed where you want the lock up to be engaged continuously With the power button engaged turn the knob until the Green LED lights and the converter clutch lock up occurs The lock up engagement speed can be changed at any time to suit driving conditions by turning the knob left or right as desired Connect Black thin wire to lead going to Upper pin Connect Red thin wire to lead going to Lower pin Transmission mounted speed sensor If speedometer fails to indicate speed when vehicle is moved then reverse connection of Black and Red wires Figure 2 CUSTOM TRANSMISSION INSTALLATION B amp M s Converter Lock Up Control is especially suited for controlling the lock up clutch in vehicles with custom transmission installations which were not originally manufactured with a torque converter clutch equipped transmission Custom transmission installations uti lizing early model transmissions with valve body controlled lock up TH 200 4R TH 700 R4 speed may re quire some modification to operate ECU controlled TCC have these correctly In these cases consult the appropriate factory service manual to locate the converter clutch shift valve train in the valve body Deactivate the converter clutch shift valve by remov ing the spring holding the valve train in the OFF position This will allow the converter c
4. e solenoids are generally hooked up to connector pin A see Figure 5 Two wire solenoids require both 12V and ground connections to operate Two wire solenoids are usually hooked up to pins A and D where A is 12V and D is ground see Figure 4 De pending on the application one or both of the solenoid wires may also be connected to pressure switches on the valve body either before or in stead of going to pin D Reversing the polarity on a two wire solenoid can damage an internal diode which pro tects the electrical system from volt age spikes TOOLS Besides normal electrical repair tools i e wire cutters stripper and terminal crimper a VOM Volt Ohm Meter ora 12V test light is required to check voltage polarity and circuit continuity Incorrect polarity connections or short circuits will damage the Converter Lock Up Control electronic module and void the warranty
5. ehicle ata steady speed and lightly depressing the brake pedal just enough to activate the brake light switch Alternatively depress the throttle a small amount but rapidly this should cause the lock up clutch to disengage then rapidly return throttle to steady speed position and lock up clutch should reengage When the lock up clutch engages and disen gages you should notice a 200 500 RPM change in engine speed If the lock up clutch is defective replace the torque converter TRANSMISSION PERFORMANCE Check overall transmission perfor mance for shift quality and timing If performance seems sluggish or shift timing is occurring too early or late check vacuum lines and transmission throttle valve or detent cable adjust ment Check transmission oil pres sures and compare them to the appro priate service manual for your vehicle If the problems persist B amp M has a complete line of products for rebuild ing and enhancing the performance of General Motors Transmissions 9500540 04 70248 LOCKUP CONTROL Slide switch in n this direction Red TCC amp Brake light switch Transmission Ring terminal ground supplied connector Switched 12 volts Black Chassis ground Red thin Eee Black thin _ INSTALLATION Installation of B amp M s Converter Lock Up Control requires clear access to the underside of the vehicle in order to properly route wires and install speed sensor Raise the
6. ith the yellow wire feeding through the switch and con tinuing down to the A terminal on the connector going into the transmission For ease of convenience the kit is supplied with the yellow wire and a black grounding wire attached to a connector that will plug directly into the transmission This yellow wire can be cut and routed to the brake light switch and then continue to the Converter Lock Up Control The short black wire can be attached to a transmission pan bolt to ground the circuit In custom applications you can bypass the brake light switch and you can plug the sup plied transmission connector directly into the transmission and ground the short Black wire from pin D We rec ommend that you wire the Converter Lock Up Control through the brake switch as a safety precaution The brake switch disengages the lock up clutch upon brake application in the unlikely event of an electrical malfunc tion Route wires next to members where they can be secured Once again remember to avoid mechanisms and hot pipes which can fray or melt the insulation and cause a short cir cuit OPERATION Operation of your B amp M Converter Lock Up Control is automatic once it has been presetto the desired lock up speed and the power button has been engaged When properly connected the Red LED on the front of the Con verter Lock Up Control should light when the ignition key is turned on if it does not please recheck the Red amp Bl
7. lutch shift valve to move to the ON position and ensure that con trol pressure is always available atthe converter clutch apply valve after the first gear shift A TH 700 converter clutch shift valve train is shown in Figure 3 as an example It may also NOTE TCC valve train and bore are not present beginning 1989 model year Remove spring if present TH 700 R4 valve body TCC valve train Figure 3 3 4th gear pulse switch TCC amp brake switch TT Note The above illustrations for reference only Your particular unit may nothave all components shown TCC amp brake switch 12 V pe i Transmission electrical connector pin identification Transmission TCC applies in 2nd 3rd or 4th gear under ECU control TH 200 4R TH 700 R4 Figure 6 be necessary to remove the oil pan and identify which kind of solenoid and wiring scheme is used on your particular unit A prewired four pin transmission connector attached to the Converter Lock Up Control mod ule is provided for these applications LOCK UP CLUTCH AND SOLENOID BASICS The lock up clutch is located inside the torque converter and is designed to eliminate torque converter slip for improved efficiency In GM vehicle s the speed at which lock up clutch en gagement occurs is controlled either by hydraulic circuits inside the trans mission or by the vehicles Electronic Control Unit ECU Lock up clutch engagement occurs when the Co
8. n verter Clutch Apply Valve changes position and vents the area behind the lock up clutch piston The converter clutch apply valve s position on off is determined by the converter clutch solenoid and the availability of control pressure In most early applications the solenoid is always energized and control pressure is supplied by a shift 4 valve in the valve body which deter mined at what speed lock up occurred Later applications eliminated the shift valve altogether and supply control pressure continuously In the later units the ECU is used to energize the sole noid at the appropriate speed by pro viding an external ground to the sole noid In all of the above cases control pressure becomes available only af ter the transmission shifts out of first gear Hence the torque converter clutch will never lock up in first gear The converter clutch solenoid is lo cated inside the transmission as are the converter clutch apply valve and if equipped Converter Clutch Shift Valve Access to these components requires oil pan removal Some appli cations may require inspection or modification of these components The lock up solenoid is connected to a four pin connector located on the transmission case The pins on these connectors are identified by the letters A B C and D Lock up solenoids come with either one or two wires The one wire style is internally grounded and requires only a 12V connection to energize One wir
9. se a VOM Volt Ohm Meter or a test light to check the continuity 2 and voltage between the proposed power source and ground STEP 3 Connectthe Red wire to 12V power source and the Black wire to ground connection located in STEP 2 Reversing the polarity of these two wires willdamage the Converter Lock Up Control module and VOID THE WARRANTY Route wires so they can not become tangled in any mecha nisms brake pedals A C heater con trols STEP 4 Route remaining wires from the Converter Lock Up Control mod ule to the transmission Make sure wires passing through the fire wall or floor pan are adequately protected against abrasion with the sheet metal Also take care not to route wires near hot exhaust pipes and high tension ignition wires The heat will melt insu lation from wires and the ignition pulses can cause unpredictable Converter Lock Up Control operation STEP 5 Using a supplied splice con nector connect the Black thin wire of the shielded cable to one of the transmission mounted speed sensor wires Attach the Red thin wire to the other speed sensor wire Depending on application there may be a Green wire Do Not attach this wire to any thing Please see Figure 2 STEP 6 For most applications con nect the Yellow wire as shown in Fig ure 1 which shows the proper wiring hookup for the Converter Lock Up Control This diagram shows the stock TCC Torque Converter Clutch and brake light switch w
10. vehicle so there is 2 feet or more ground clearance MAKE SURE THE VEHICLE IS RIG IDLY AND SECURELY SUPPORTED JACK STANDS WHEEL RAMPS OR A HOIST WORKS BEST DO NOT USE JACKS ALONE WIRING REQUIREMENT The B amp M Converter Lock Up Con trol is relatively simple to hook up There are five wires connected to the Converter Lock Up Control module which are color coded and have the following functions COLOR FUNCTION Red 12V 5A 10A fused ignition key controlled source Black Chassis ground Yellow Supplies 12V to transmission lock up clutch solenoid 40 Pulse Rev Transmission mounted speed sensor Figure 1 Red thin Speed sensor Black thin Speed sensor Green thin Shield wire not shown Installation of the B amp M Converter Lock Up Control requires hooking up only the Red Black and Yellow wires the Black thin and Red thin wires will need to be spliced from housing and plugged into control STANDARD INSTALLATION STEP 1 Choose an accessible loca tion on the dash to mount the Con verter Lock Up Control module Us ing rubbing alcohol clean the sur face Remove the backing from the hook amp loop tapes and install on the Converter Lock Up Control module amp dash STEP 2 Locate ignition key controlled 5A 10A fused source of 12V anda good chassis ground connection Most GM fuse panels have an instrument section that can be tapped to supply the Converter Lock Up Control module U
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