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Home >> GMC >> 2009 >> Acadia SLT, FWD >> Repair and Diagnosis >> Transmission >> Hydraulic Diagrams >> Automatic Transmission - 6T75 - Removal & Installation, Service, Overhaul, Troubleshooting & Diagnosis >> Diagnostic Information And Procedures >> No Fourth, Fifth, and Sixth Gear

No Fourth, Fifth, and Sixth Gear

Checks Causes
4-5-6 Clutch Assembly
  • Inspect for damaged or broken 4-5-6 Clutch Piston (433) and Piston Seals (430-432)
  • Inspect for broken or disengaged 4-5-6 Backing Plate Retainer (442)
  • Inspect for damaged or broken 4-5-6 Clutch Dam Piston (435) and piston seals damaged, worn or delaminating
  • Inspect for broken or disengaged 4-5-6 Clutch Dam Retainer (436)
  • Inspect for sheared or stripped splines on the Reaction Carrier Hub (438)
  • Inspect for sheared or stripped splines on 3-5-Rev/4-5-6 Housing to Turbine Shaft (422)
  • Inspect for loose, worn or damaged 3-5-Rev/4-5-6 Housing Bushing
  • Inspect for broken, porous or improper surface finish or plugged oil passages of the 3-5-Rev/4-5-6 Housing (422)
  • Inspect for failure of the Input Shaft Thrust Bearing (32)