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Home >> GMC >> 2024 >> Terrain SLT, FWD >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transmission - 9T45 (M3U) Or 9T50 (M3D M3H) - Diagnostic Information And Procedures (2 Of 2) >> Diagnostic Information and Procedures >> Harsh Garage Shift

Harsh Garage Shift

Checks Causes
Input Carrier Assembly (552)
  • Inspect for worn or stripped Output Internal Gear Splines.
1-Reverse and 1-2-3-4-5-6 Clutch Piston Housing (590)
  • Inspect for damaged or fatigued 1 - 2 - 3 - 4 - 5 - 6 Clutch Wave Plate (595). Refer to Clutch Plate Diagnosis .
  • Inspect for stripped or sheared splines on 1 - 2 - 3 - 4 - 5 - 6 Clutch Plate (596). Refer to Clutch Plate Diagnosis .
  • Inspect for correct fluid level.