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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 First and Reverse Gears

No First and Reverse Gears

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).
Case Cover Assembly (403)
  • Inspect for disengaged or broken low and reverse clutch piston spring retainer (410).
  • Inspect for worn, damaged or debonding low and reverse clutch piston seals (408).
  • Inspect for broken or deformed low and reverse clutch piston (408).
  • Inspect for improperly position or too large bleed hole in low and reverse piston (408).
  • Inspect for porosity or improper finish on the case cover.
  • Inspect for broken or fatigued low and reverse clutch piston return spring (409).