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Home >> Buick >> 2007 >> Lucerne CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 246 (Automatic Transaxle - 4T65-E - Overhaul) >> Description and Operation >> Automatic Transmission Hydraulic Diagrams >> Manual First Gear (With Touch Activated Power) >> Notes

Manual First Gear (With Touch Activated Power): Notes

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A manual 2-1 downshift is initiated by moving the gear selector lever to the Manual position. However, the transmission will not downshift into First gear until vehicle speed is below approximately 60 km/h (37 mph). At higher vehicle speeds the PCM will keep 1-2 shift solenoid (SS) valve de-energized (OFF) and the transmission will operate in Manual - Second Gear. Also, the third clutch is applied in Manual First - First Gear to provide engine compression braking.

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