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8. Check for TCC apply in THIRD and FOURTH gear. Note the TCC apply point. When the TCC applies there should be a noticeable drop in Check for DTCs. Refer to Torque Converter Diagnosis. Refer to the table Shift Speed for the correct apply speed. Part Throttle Detent Downshift 1. Place the gear selector in the OVERDRIVE position. 2. Accelerate the vehicle to 64-88 km/h (40-55 mph) in FOURTH gear. 3. Quickly increase throttle angle to greater than 50 percent. 4. Verify the following: The TCC releases. The transmission downshifts immediately to THIRD gear. Full Throttle Detent Downshift 1. Place the gear selector in the OVERDRIVE position. 2. Accelerate the vehicle to speeds of 64-88 km/h (40-55 mph) in FOURTH gear. 3. Quickly increase throttle angle to 100 percent (WOT). 4. Verify the following: The TCC releases. The transmission downshifts immediately to SECOND gear. Manual Downshifts The shift solenoid valves do not control the initial downshift for the 4-3 or the 3-2 manual operation and the vehicle speed is as shown in the Shift
2007 Hummer H3 2007 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - H3
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