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Home >> Chevrolet >> 2012 >> Corvette ZR-1, Trans Mfr CD 6L95M/MH3 >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 4 (Automatic Transmission - 6L80 - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> No Third, Fifth, and Reverse Gear

No Third, Fifth, and Reverse Gear

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No Third, Fifth, and Reverse Gear

Checks Causes
Automatic Transmission Fluid Pan (29) Verify proper fluid level and condition, inspect transmission assembly for leaks.
Control Valve Upper Body Assembly (304)
  • Inspect for sticking, damaged, or worn 3-5-R regulator valve (336) and valve spring (326).
  • Inspect for damaged or stuck #7 ball check valve.
Control Valve Lower Body Assembly (307) Inspect for worn, damaged, or sticking clutch select solenoid valve 3 (352) and valve spring (353).
1-2-3-4 and 3-5-R Clutch Assembly (51)
  • Inspect for proper installation of 3-5-R clutch backing plate retaining ring (400).
  • Inspect for worn, damaged, or leaking clutch bearing seal assembly (428).
  • Inspect for damaged or worn 3-5-R clutch plates (401-404).
  • Inspect for damaged 3-5-R clutch piston (421), apply ring (405), and spring (420).
  • Inspect for cut, worn, or damaged 3-5-R clutch piston dam O-ring seal (418), inner seal (419), and outer seal (422).
  • Inspect for improper selective 3-5-R clutch backing plate retaining ring (400).
Control Valve Solenoid Body Assembly (314) Pressure control solenoid 2 commanded/failed HIGH (off) or leaking - Perform solenoid valve assembly function test. Refer to Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test .
Automatic Transmission Fluid Pump Seal (19) Inspect for damage or leaks.
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