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Home >> Buick >> 2007 >> Lucerne CX >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 2 (Automatic Transaxle - 4T80-E - Introduction (2 Of 2)) >> Description and Operation >> Automatic Transmission Hydraulic Diagrams >> Manual First Gear >> Notes

Manual First Gear: Notes

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When the gear selector lever is moved to the Manual First (1) gear range, the manual valve moves and allows line pressure to enter the Low fluid passage. If the vehicle is operating below 56 km/h (35 mph), the transmission will shift immediately into first gear. the transmission is prevented from upshifting. During the shift into Manual First gear, the following changes occur within the transmission:

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