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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 Fourth, Fifth, and Sixth Gear

No Fourth, Fifth, and Sixth Gear

Checks Causes
4-5-6 Clutch Assembly
  • Inspect for damaged or broken 4-5-6 clutch piston (433) and piston seals (430-432).
  • Inspect for broken or disengaged 4-5-6 backing plate retainer (442).
  • Inspect for damaged or broken 4-5-6 clutch dam piston (435) and piston seals damaged, worn or delaminating.
  • Inspect for broken or disengaged 4-5-6 clutch dam retainer (436).
  • Inspect for sheared or stripped splines on the reaction carrier hub (438).
  • Inspect for sheared or stripped splines on 3-5-rev/4-5-6 housing to turbine shaft (422).
  • Inspect for loose, worn or damaged 3-5-rev/4-5-6 housing bushing.
  • 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 damaged, stripped or sheared splines on 4-5-6 clutch plates (439441).
  • Inspect for broken or fatigued 4-5-6 clutch piston return spring (434).