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GM SPORT COMPACT Performance Build Book 103 4T65 RACING TRANSMISSION COMPONENTS This handbook section illustrates parts and modifications that are used to transform a 4T65-E automatic transmission for Off-Highway drag racing. Starting with the heavy duty or supercharged application of the production transmission, the gearbox is modified into a three speed transmission with driver shift control utilizing an aftermarket performance torque converter. The changes have proven to be reliable behind a 600 hp engine and track proven behind a 1000+ hp ECOTEC engine. The information contained in this section of the handbook has been provided by GM Powertrain in conjunction with GM Racing. The photographs shown are from a transmission that is configured for Sport Compact Drag Racing. This handbook attempts to illustrate the changes; however, it is not totally inclusive of all changes needed for a 1000+ hp application. Extensive modifications have been developed by GM Racing/Hydra-Matic to keep this transaxle consistantly performing at high horsepower levels. Fig. 190 The rear view above shows the oil pan modifications, transbrake location, plumbing, the output speed sensor location and wiring. (Fig. 190) 4T65 RACING TRANSMISSION COMPONENTS 104 TRANSBRAKE GM SPORT COMPACT Performance Build Book Fig. 191 The transmission brake is mounted externally on top of the transmission case and is operated with an on-off switch by the driver. A transmission brake may not be required on applications below 800 hp. (Fig. 191) Fig. 193 The major sub-assemblies of the transbrake are shown above. The check ball assembly is not shown. (Fig. 193) Fig. 192 The transbrake assembly is mounted externally above the reverse band servo cover and requires a 12 volt current to activate it. (Fig. 192) Fig. 194 The two fittings shown in the case are used for the transbrake system. The fitting in the lower left of the view is where low-1st gear oil is routed from the transbrake to apply the reverse band. When the transbrake is released, the oil is exhausted through the fitting shown in the upper right corner of the picture. (Fig. 194) 4T65 RACING TRANSMISSION COMPONENTS GM SPORT COMPACT Performance Build Book 105 Fig. 195 A clearance hole through the case bell housing is provided for plumbing of the supply oil to the transbrake. (Fig. 195) Fig. 197 This is the location of the transbrake pass-thru fitting on the case cover side of the case. Case ribbing is cut back to allow for clearance of the transbrake supply plumbing in this side of the case. (Fig. 197) TRANSMISSION CASE Fig. 196 This is the location of the transbrake pass-thru fitting on the torque converter side of the case. Oil is routed from this fitting through the hole in the top of the transmission bell. (Fig. 196) Fig. 198 Three passages are plugged in the lower part of the case because the 2-3 accumulator and the manual 2-1 servo are eliminated in the race unit. This allows two of these plugged passages to be drilled through for use as additional drain hole for the side cover cavity. The 1-2 accumulator is used in the race unit but the 2nd clutch feed oil to it, is reduced. (Fig. 198) 4T65 RACING TRANSMISSION COMPONENTS 106 GM SPORT COMPACT Performance Build Book STATOR SUPPORT Fig. 199 Six additional oil drain holes have been added to the bottom barrel of the case. The thermal element is eliminated. A fitting is added for direct plumbing of forward servo oil from the lower accumulator housing. (Fig. 199) Fig. 201 The O.D. of the drive sprocket support (stator support) is cut to clear the 1 wide x 7/16 pitch drive sprockets. (Fig. 201) TORQUE CONVERTER Fig. 200 The outlets of the additional side cover drain back holes in the case is shown above. The 3rd clutch oil passage is also plugged to keep oil from accumulating in the 2-3 accumulator cavity. Also shown is the transmission oil cooler loop. A transmission oil cooler is not required for this application. (Fig. 200) Fig. 202 The torque converter is manufactured by Coan Transmissions & Converters as specified for each application. (Fig. 202) 4T65 RACING TRANSMISSION COMPONENTS GM SPORT COMPACT Performance Build Book 107 INPUT SHAFT DRIVE CHAINS Fig. 203 The race input (or turbine) shaft is shown above on the right. The race shaft has increased wall thickness and the torque converter seal groove has been removed. In addition, the diameter of the shaft where the two torque converter seals are seated, has been reduced. (Fig. 203) OIL PUMP SHAFT Fig. 205 Shown is the production dual Gemini chain and sprockets. (Fig. 205) Fig. 206 The drive chain in the race unit is a 1 wide x 7/16 pitch chain with specially designed sprockets. (Fig. 206) Fig. 204 The race pump shaft is on the top. This shaft is modified to fit inside the thicker walled turbine shaft. (Fig. 204) 4T65 RACING TRANSMISSION COMPONENTS 108 GM SPORT COMPACT Performance Build Book THIRD GEAR CLUTCH Fig. 207 The chain on the right (two required per transmission) is a production chain. The chain in the center, 1 wide x 3/8 pitch, was initially developed for the race unit, but was replaced by the 1 wide x 7/16 pitch chain on the left to handle the high horse power and torque. The 1 wide x 3/8 chain is excellent for applications up to 800 hp. (Fig. 207) SECOND GEAR CLUTCH Fig. 209 The production 3rd clutch pack is not used in the race unit. (Fig. 209) Fig. 210 The racing 3rd clutch pack is a specially designed Z-Pack 3rd clutch pack from Raybestos Powertrain. (Fig. 210) Fig. 208 The production 2nd clutch pack is used in the race unit. (Fig. 208) 4T65 RACING TRANSMISSION COMPONENTS GM SPORT COMPACT Performance Build Book 109 OIL DAM Fig. 211 The race unit uses a specially designed backing plate from Raybestos Powertrain for the Z-Pack 3rd clutch. (Fig. 211) SINGLE WRAP BAND Fig. 213 The production oil lube dam has been modified so that it can be assembled with the 4.0 final drive components. (Fig. 213) PLANETARY SET Fig. 212 The production reverse band is modified to be a single wrap band for quicker release of the transbrake. (Fig. 212) Fig. 214 The input planetary carrier and reaction planetary carrier are stock V-8 application components. The gear sets are used without modifications. (Fig. 214) 4T65 RACING TRANSMISSION COMPONENTS 110 SPRAGS GM SPORT COMPACT Performance Build Book PARK PAWL GEAR Fig. 215 The current production pawl type one-way clutches are used for 3rd and input without modifications. The one-way clutch on the left has the retainer removed to show internal components. (Fig. 215) SUN GEAR AND SHAFT Fig. 217 The I.D. spline on the production park gear (component on the left) is enlarged to fit onto the one piece sun gear / sun gear shaft. (Fig. 217) TORSEN DIFFERENTIAL Fig. 216 The production sun gear and sun gear shaft on top is replaced by a one-piece design in order to package a final drive gear ratio change to 4.0. The one piece sun gear / sun gear shaft requires a revised park gear. (Fig. 216) Fig. 218 The production differential is replaced by a torque-biasing differential. The pinion carrier in the assembly is also replaced. The pinions in the carrier shown above are for a 4.0 final drive ratio. (Fig. 218) 4T65 RACING TRANSMISSION COMPONENTS GM SPORT COMPACT Performance Build Book 111 ACCUMULATOR AND FORWARD SERVO Fig. 219 Production differential and pinion carrier. (Fig. 219) RACE OUTPUT FLANGES Fig. 221 Shown is the race unit with the lower accumulator assembly, oil baffle plate, and forward servo plumbing installed. Note that the thermal element and manual 2-1 servo assembly are missing along with the oil pick up tube and oil level indicator stick. The lower accumulator assembly does not contain the 2-3 accumulator components. (Fig. 221) MODIFIED FLUID PICK-UP Fig. 220 The race output flanges were designed to work with Porsche 930 CV joints. (Fig. 220) Fig. 222 The race unit fluid pick-up tube has been designed to work with a deep angled pan. The production filter is not used. A fine mesh screen is used on the inlet to filter the transmission fluid. (Fig. 222) 4T65 RACING TRANSMISSION COMPONENTS 112 RACE TRANSMISSION PAN 22° GM SPORT COMPACT Performance Build Book SEPARATOR PLATE Fig. 223 This deep oil pan has been designed designed to work with a 22° rotation of the powertrain in the vehicle. When installed in the vehicle, the bottom of the pan is horizontal. (Fig. 223) MODIFIED TUBE AND INDICATOR Fig. 225 Only modification to the valve body separator (spacer) plate is to enlarge the #2Y or #33 (input clutch feed) hole to a diameter of 0.160 inches. (Fig. 225) VALVE BODY Fig. 224 A production Grand Prix, Bonneville, Monte Carlo, etc. transmission fill tube is shortened at the fill end and lengthened at the pan end to accomodate the deeper pan. The locking dip stick is a shortened production 4L65-E GM light-duty pickup trucks fluid dip stick. (Fig. 224) Fig. 226 Shown above is one of the two modifications to the race unit valve body. The fluid through the #5 reverse servo check ball is re-routed to act as a check valve so that when the transbrake is applied, the reverse oil does not leak through the manual valve. (Fig. 226) 4T65 RACING TRANSMISSION COMPONENTS GM SPORT COMPACT Performance Build Book 113 Fig. 227 The other modification to race unit valve body is the plugging of the torque converter clutch oil port to the pressure switch manifold (PSM). The PSM is eliminated from the race unit. (Fig. 227) PRESSURE REGULATOR Fig. 229 The second modifications to the pressure regulator assembly is the removal of the middle spool of the pressure regulator valve. By removing the spool, oil flow to the converter is never interrupted. (Fig. 229) CASE COVER Fig. 228 A spring has been added between the line boost valve and the valve bore plug. It has to maintain a 300 PSI line pressure. (Fig. 228) Fig. 230 Shown above are two modifications to the race unit case cover (channel plate). Shown in the upper right corner is the rerouting for the #5 reverse servo check ball. Also shown is the plug in the 4th clutch oil passage to 3-4 accumulator. (Fig. 230) 4T65 RACING TRANSMISSION COMPONENTS 114 GM SPORT COMPACT Performance Build Book Fig. 231 The torque converter blow-off valve is removed and is plugged in the case cover. (Fig. 231) Fig. 233 A closer view showing the Honeywell magnetic pickup (input speed sensor) mounted in the 3-4 accumulator bore with the 1 drive sprocket positioned on the case cover. The 3-4 accumulator piston pin bore is plugged because the 3-4 accumulator components are not used in the race unit because it is a three speed transmission. (Fig. 233) SHIFT CONTROLS Fig. 232 Shown above is the case side of the case cover with the plumbing used to supply the trans brake with low-1st gear oil. A 1 drive sprocket and the wire leads from the input speed sensor are also shown. The production input speed sensor is removed and its bore plugged. (Fig. 232) 4T65 RACING TRANSMISSION COMPONENTS Fig. 234 GM SPORT COMPACT Performance Build Book 115 4T65E SHIFT ALGORITHM The 4T65E transmission is shifted with two shift solenoids. The ground sides of the solenoids are pin A and pin B in the pass through connector. Pin E requires switched 12V. The shift algorithm of the 4T65E is: SHIFT ALGORITHM OF THE 4T65E Solenoid A Solenoid B 1st gear on on 2nd gear off on 3rd gear off off 4th gear on off An easy and cheap way to shift the 4T65E is with two toggle switches. The toggle switches need to switch ground to pins A and B in the pass through connectors. To operate the transmission turn both switches on. This will put the transmission in 1st gear. To shift into 2nd gear shut off the switch to solenoid A off. To shift into 3rd gear shut off the switch to solenoid B. For 4th gear turn the switch for solenoid A back on. SHIFT CONTROLLERS TCI and CompuShift offer automatic shift controllers that will operate the 4T65E Transmission. These are excellent choices for street strip applications. An inexpensive alternative for drag racing and occasional street use is the MSD Programmable shift controller part number 7559. (Fig. 234) This controller was developed to shift a Lenco type transmission. With a little ingenuity it can easily be adapted for use on the 4T65E transmission. Two relays are needed to convert the system for this application. The MSD controller needs two inputs a: Launch / Reset and Shift Override. The Launch / Reset button resets the controller to first gear both in electrical outputs and in the shift sequence. The Shift Override button manually up-shifts the controller. In first gear the controller does not output a signal. When the 1-2 shift is made it turns on a 12v signal. When the 2-3 shift is made another 12V signal is turned on. Since the solenoid needs a ground to activate, relays are needed. Ground should be connected to the input of two relays. The Normally Closed output of the 1st relay should be connected to pin A on the transmission pass through connector. The normally closed output of the 2nd relay should be connected to pin B of the transmission pass through connector. One side of the coil of each relay should be connected to ground. The 1st shift output from the transmission controller should be connected to the other side of the coil of the 1st relay. The 2nd shift output from the transmission controller should be connected to the other side of the coil on the 2nd relay. The normally open side of the relay can be used for gear indicator lights. Two lights can be connected to power and the other side of the lights connected to the normally open side of the first and second relays. When the transmission is in 1st both lights will be off, in second the 1st light will turn on and in 3rd the second light will come on. · MSD Programmable Shift Controller PN 7559 (Fig. 234) TRANSMISSION FLUID INFORMATION Fluid Type: GM Dexron III (part number 9985912) or Allison Transmission Fluid: TranSyndTM. TransSyndTM is a fully synthetic automatic transmission fluid that is used in the 4T65 race transmissions for Sport Compact Drag Racing. Fluid Quantity: Fluid fill quantity will depend on the oil pan configuration and whether the torque converter is dry. Past experience has shown that about twelve quarts are added to the 4T65 transmission with a dry torque converter. Always check the fluid level at operating temperature and while the engine is idling. Do not overfill - keep the level below the spinning components of the transmission to reduce foaming of the fluid. Track experience has found that checking the oil level at engine idle and in first gear with brakes applied produces a consistent readable oil level indication on the dip stick. 4T65 RACING TRANSMISSION COMPONENTS NOTES GM SPORT COMPACT Performance Build Book 117 4T65E PERFORMANCE TRANSMISSION PARTS LIST PARTS LIST DESCRIPTION PART NUMBER 4T65--E Assembly for Race Applications only CPT700 1x7/16 Sprocket/Chain Set, (Ratio 1) 28 tooth drive, 32 CPT701 tooth driven, 7/16 Chain, Drive Sprocket support Assy. 17/16 Sprocket/Chain Set, (Ratio 2) 29 tooth drive, 31 tooth driven, 7/16 Chain, Drive Sprocket Support Assy. CPT702 1x3/8 Sprocket/Chain Set, (Ratio 1) 33 tooth drive, 37 tooth driven, 3/8 Chain, Drive Support Assy. CPT703 1x3/8 Sprocket/Chain Set, (Ratio 2) 35 tooth drive, 35 tooth driven, 3/8 Chain. CPT704 LINK ASM--DRV (7/16 Pitch Chain) CPT705 LINK ASM--DRV (3/8 Pitch Chain) CPT706 SHAFT ASM--TURBINE (Input Shaft Assembly) Turbine CPT707 Shaft and Sleeve (800 hp application) SHAFT ASM--TURBINE (Input Shaft Assembly) Turbine CPT708 Shaft and Sleeve and pump shaft (1200 hp application) 3rd Gear Clutch Pack CPT709 Differential and Final Drive Assembly 3.29 incl. Torsen, pinion gears, pins Differential and Final Drive Assembly 3.29 without gears & pins Differential and Final Drive Assembly 4.0 incl Sun and Park Gears Sungear and Sungear shaft GEAR--PARK 930 CV Output Flange RH 930 CV Output Flange LH Adapter Plate -- ECOTEC to 4T65 Template for Bell--housing pattern 4T65--E CASE Assembly w/ increased bell--housing wall thickness Torque Converter Planetary Assembly Tech Manual 4T65 CPT710 CPT711 CPT712 CPT713 CPT714 CPT715 CPT716 CPT717 24225850 -- SOURCE GM Racing GM Racing (4M Sprocket, BW Chains) GM Racing GM Racing GM Racing GM Racing GM Racing GM Racing GM Racing Raybestos Z-Pack (Version 2's P/N: RZP003) GM Racing GM Racing GM Racing GM Racing GM Racing GM Racing (Bates) GM Racing GM Racing Coan GM Service Part Service Manual 4T65E PERFORMANCE TRANSMISSION PARTS LIST NOTESAcrobat Distiller Command 3.01 for AIX 4.1.1 and later (RS6000) XyEnterprise XPP 7.2C.1 Patch #8