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Home >> Chevrolet >> 2013 >> Corvette Z06 >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 4 (Automatic Transmission - 6L80 - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> No First and Reverse Gears

No First and Reverse Gears

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No First and Reverse Gears

Checks Causes
A/Trans Fluid Pan Assembly (29) Verify proper fluid level and condition, inspect transmission assembly for leaks.
Control Valve Upper Body Assembly (304) Inspect for sticking, damaged, or worn 1st/rev and 4-5-6 clutch regulator valve (327) and spring (326).
Control Valve Lower Body (307) Inspect for sticking, damaged, or worn clutch select valve 3 (352) and spring (353).
Control Valve Lower Body (307) Inspect for sticking, damaged, or worn clutch select valve 2 (352) and spring (353).
Control Valve Upper Body Assembly (304) Inspect for sticking, damaged, or worn #2 ball check valve
Center Support (67)
  • Inspect for damaged low and reverse clutch piston assembly (470), spring (469), spring retaining ring (466), and center support assembly (459).
  • Inspect for damaged or worn low and reverse clutch plates (463-465).
  • Inspect for damage low and reverse clutch backing plate retaining ring (461).
  • Inspect for damaged low clutch sprag assembly (467). Holding the sprag assembly with the retaining ring facing up, and the inner race of the sprag assembly fixed, the outer race should freewheel counterclockwise.
  • Inspect for cut, worn, or damaged low clutch sprag seal (468).
Center Support Fluid Passage Seal (20)
  • Inspect for worn, cut, or damaged seals.
  • Inspect for proper seal (20) size (6L45/50E MYA/MYB) vs (6L80/90E MYC/MYD).
Automatic Transmission Fluid Pump Cover (219) Inspect for sticking or damaged TCC control valve (227).
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