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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 First, Second, Third, and Fourth Gear

No First, Second, Third, and Fourth Gear

Checks Causes
1-2-3-4 Clutch Assembly
  • Inspect for damaged or worn 1-2-3-4 clutch plates (456-458).
  • Inspect for damaged or broken 1-2-3-4 clutch piston (461) and piston seals damaged, worn or delaminating
  • Inspect for broken or binding 1-2-3-4 clutch piston return spring (460)
  • Inspect for broken or disengaged 1-2-3-4 clutch piston return spring retainer (459)
Output Sun Gear Assembly (457) Inspect for stripped or sheared splines on the Output Sun Gear shell
Reaction Carrier Assembly (467)
  • Inspect for stripped or sheared splines on the Input Ring Gear
  • Inspect for disengaged or broken Input Ring Gear Retainer
Output Carrier Assembly (474)
  • Low/Reverse Clutch Assembly (OWC) (455) splines sheared or broken
  • Inspect for disengaged or broken Reaction Ring Gear Retainer