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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 >> No Reverse Gear

No Reverse Gear

Checks Causes
Low and Reverse Clutch Assembly (455)
  • Inspect for disengaged or broken low and reverse clutch retainer (454).
  • Inspect for stripped or sheared splines on low and reverse clutch (455).
Low and Reverse Clutch
  • Inspect for stripped or sheared splines on low and reverse clutch plates (449-453).
  • Inspect for damaged, deformed or improper surface finish on the low and reverse clutch plates (449-453).
3-5-Reverse Clutch Assembly
  • Inspect for damaged, worn or stripped splines on 3-5-Reverse Clutch Plates (423-426), Backing Plate (426)
  • Inspect for sheared or stripped splines on 3-5-Rev/4-5-6 Housing to Turbine Shaft (422)
  • Inspect for damage, improper surface finish, porosity, deformed or unbalanced 3-5-Rev/4-5-6 Housing (422)
  • Inspect for damaged, worn, loose or seized hub bushing in the 3-5-Rev/4-5-6 Housing
  • 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)
  • Inspect for disengaged or broken 3-5-Reverse Clutch Backing Plate Retainer (427)
  • Inspect for damaged, worn or leaking 3-5-Reverse Clutch Piston Seals (419-421)
  • Inspect for damaged or broken 3-5-Rev/4-5-6 Clutch Housing (422)
  • Inspect for warped, damaged, improper surface finish or debonding 3-5-Reverse Clutch Piston (417)
  • Inspect for broken or fatigued 3-5-Reverse Clutch Spring (418)
  • Inspect for disengaged or broken Speed Sensor Reluctor Retainer (415)
  • Inspect for broken Speed Sensor Reluctor Wheel (416)
  • Inspect for seized Input Shaft Thrust Bearing (32)