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Home >> GMC >> 2011 >> Yukon Base, 5.3 3 >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 13 (Automatic Transmission - 2ML70 - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> No Fourth Gear

No Fourth Gear

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No Fourth Gear

Checks Causes
4th Clutch Assembly
  • Inspect for damaged or worn clutch plates.
  • Inspect for damaged piston, piston dam, dam retaining ring, and clutch spring.
  • Inspect for improper selective 4th clutch backing plate retaining ring.
  • Inspect for cut, worn, or damaged turbine shaft fluid seal rings.
  • Inspect for damaged or distorted turbine shaft.
Control Valve Upper Body Assembly Inspect the 12-3-4 clutch regulator valve and spring for wear or damage.
Output Shaft Assembly Inspect for damaged or stripped internal splines on the output shaft assembly.
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