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Subject: Engagement Time of Electronically Controlled Transmissions in General Motors Vehicles (Garage Shins, Park to Reverse, Neutral to Drive, Neutral to Reverse, Park to Drive, Delayed Engagement) Models: 2000-2002 Chevrolet Cámaro 2000-2005 Chevrolet Corvette 2000-2002 Pontiac Firebird 2004-2006 Pontiac GTO 2000-2007 All GM Light Duty Trucks 2003-2007 HUMMER H2 2006-2007 HUMMER H3 2005-2007 Saab 9-7X with 4L60-E (RPO M30) or 4L65-E (RPO M32) Automatic Transmission Supercede: This bulletin is being revised to remove 2006-2007 Chevrolet Corvettes. Please discard Corporate Bulletin Number 03-07-30-007C (Section 07 – Transmission/Transaxle). Park/Neutral to Reverse or Drive (commonly called garage shift) engagement times may be different from what many customers might be accustomed to especially if they have recently traded for a General Motors vehicle. Normal Park/Neutral to Reverse or Drive engagement time will be in the vicinity of one (1) second if the automatic transmission fluid (ATF) is above 0°C (32°F) . When the ATF is colder than 0°C (32°F), the engagement time will become longer the colder the transmission fluid. A time limit factor cannot be placed on proper engagement times because the factors that affect transmission operation are many. At the moment of engine start, for economy and emission requirements, the transmission line pressure is maintained at low levels. This allows a lower cold idle engine RPM (the colder the oil is the higher the energy level (engine torque output) required to pressurize the oil).

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Transmission Replacement Tools Required J 42371 Hydraulic Clutch Line Separator Removal Procedure 1. 2. 3. 4. 5. 6. Shift the transmission into 3rd or 4th gear. Remove the shift lever assembly. Drain the transmission fluid. If vehicle is a 2 wheel drive (2WD), remove the propeller shaft. If vehicle is a 4 wheel drive (4WD), remove the transfer case. Using J 42371, push back on the white plastic sleeve on the quick connect in order to separates the hydraulic clutch line from the clutch actuator quick connect. 7. Disconnect the following engine wiring harness electrical connectors: Backup lamp switch (1) Vehicle speed sensor (VSS) (3) Oxygen sensor (4) 8. Remove the oxygen sensor (2) from the transmission bracket. 9. Remove the engine harness clips from the fuel feed/return line clip/bracket. Zoom Sized for Print 10. If equipped with 4WD, remove the vent hose clip from the bracket. 11. If equipped with 4WD, remove the vent hose clip (1) from the fuel feed/return hose bracket. Zoom Sized for Print 12. If equipped with 4WD, remove the fuel feed/return hose clip from the bracket. 13. Remove the starter. 14. Support the transmission using a suitable transmission jack. 15. Remove the transmission support. Zoom Sized for Print 16. Disconnect the vent hose from the transmission. 17. Remove the vent hose clip from the clutch housing. Zoom Sized for Print 18. Remove the transmission to clutch housing bolts. 19. Remove the transmission from the clutch housing.

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All vehicles 1. Disconnect the battery ground cable. For additional information, refer to Section 414-01. 2. With the vehicle in NEUTRAL, position on a hoist. For additional information, refer to Section 100-02 4×4 vehicles 3. Remove the transfer case. For additional information, refer to Section 308-07A. 4. To maintain initial driveshaft balance, index-mark the front flange and pinion flange. ? Remove the four bolts and remove the front driveshaft. 4×2 vehicles 5. Remove the rear driveshaft. For additional information, refer to Section 205-01. All vehicles 6. NOTE: Drain the transmission fluid if the transmission is disassembled, or installation of a new transmission is necessary. Place a drain pan under the transmission fluid pan. 7. Drain the transmission fluid. Loosen the transmission fluid pan bolts and allow the fluid to drain. After the fluid has drained, remove the bolts. Remove the transmission fluid pan and transmission fluid pan gasket. 9. NOTE: The transmission fluid pan gasket is reusable. Clean and inspect for damage. If not damaged, the gasket should be reused. Install the transmission fluid pan and gasket. 1. Position the transmission fluid pan gasket. 2. Position the transmission fluid pan. 10. Install the bolts. 11. Remove the starter motor solenoid terminal cover. 12. NOTE: The 4.6L engine is shown, the 4.2L and 5.4L engines are similar. Disconnect the starter motor electrical connectors. 4.2L engines 13. Remove the bolt, stud bolt and starter. 4.6L and 5.4L engines 14. Remove the starter motor. 1. Remove the stud bolt. 2. Remove the two bolts. 3. Remove the starter.

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Automatic Transmission/Torque Converter Clutch (TCC) Shudder, Water in Transmission (Repair Transmission and Replace Transmission Filler Tube, Level Indicator and Seal) Condition Some customers may comment on a shudder condition at approximately 64-80 km/h (40-50 mph) when the TCC engages. Cause This condition may be caused by water in the automatic transmission fluid (ATF). Water may enter the transmission by dripping from the cowl area onto the handle of the transmission fluid level indicator. Indications of water in the ATF may include: • Visible rust on the transmission fluid level indicator. • Visible water in the oil pan. • A milky white substance inside the pan area. • Spacer plate gaskets that appear to be glued to the spacer plate, valve body or case. • Rust on internal transmission iron/steel components. Correction First, repair the transmission and second, replace the transmission fill tube, seal and level indicator to prevent repeat water contamination of the ATF. Transmission Repair 1. Remove the transmission. Refer to the appropriate SI procedure. 2. Disassemble and inspect the transmission. Refer to Unit Repair Automatic Transmission – 4L60-E/4L65-E. Important: If water or coolant is found in the transmission, the following components MUST be replaced. • Replace all of the rubber type seals. • Replace all of the composition-faced clutch plate assemblies including the band. • Replace all of the nylon parts (Thrust Washers). • Replace the torque converter. • Thoroughly clean and rebuild the transmission, using new gaskets and oil filter. • Flush and flow check the transmission oil cooler using J 45096. Refer to Corporate Bulletin Number 02-07-30- 052C or newer – Automatic Transmission Oil Cooler Flush and Flow Test Essential Tool J 45096 TransFlow . Replace the Transmission Fluid Filler Tube, Seal and Fluid Level Indicator WITH the transmission REMOVED from vehicle. 1. Remove the transmission fluid filler tube from the transmission. 2. Replace the transmission fill tube seal, P/N 1259475. 3. Replace the transmission fill tube, P/N 15000220, following the appropriate SI Document for Transmission Installation. 4. Replace the transmission fluid level indicator, P/N 15069769 when appropriate during the transmission installation. Replace the Transmission Fluid Filler Tube, Seal and Fluid Level Indicator with the transmission in the vehicle. 1. Remove the air cleaner outlet duct. Refer to Air Cleaner Element Replacement (SI Document ID# 1364496). 2. Remove the transmission fluid level indicator from the filler tube.

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OVERHAUL – 4L60-E Fig. 16: Exploded View Of 4L60-E Transmission Internal
Components GENERAL MOTORS CORP.
1995 Chevrolet Chevy Van G20