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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transmission - 6T70 - Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> Harsh Garage Shift

Harsh Garage Shift

Checks Causes
Input Carrier Assembly (470) Inspect for worn or stripped ring gear splines
Case Assembly (51)
  • Check the engine for diagnostic codes. If the engine controller signals the transmission that engine torque is inaccurate, the transmission will command high line pressure.
  • Check line pressure at idle is below 800kPa.
  • Inspect for stuck valves in the lower valve body, particularly the boost valves.
  • Inspect for damaged or fatigued 1-2-3-4 clutch wave plate (458) and low and reverse clutch wave plate (450).
  • Inspect for stripped or worn splines on 1-2-3-4 clutch plate (456).
  • Inspect for improperly positioned or plugged low reverse piston (408) air bleed.
  • Inspect for correct fluid level.
Low and Reverse Clutch Assembly (OWC) (455) Inspect for stripped or sheared internal and external splines on the low and reverse clutch assembly (455).