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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 >> Harsh Fourth, Fifth, and Sixth Shift

Harsh Fourth, Fifth, and Sixth Shift

Checks Causes
4-5-6 Clutch Assembly
  • Inspect for leaking 4-5-6 clutch piston (433) and piston seals (430-432).
  • Inspect for plugged or restricted 4-5-6 piston dam air bleed.
  • Inspect for fatigued 4-5-6 clutch piston spring (434).
  • Inspect for leaking 4-5-6 clutch dam seals (435).
  • Inspect for improper surface finish on 4-5-6 clutch plates (439-441).
  • Inspect for porous, improper surface finish, seal groove damage or plugged or restricted oil passages of the 3-5-rev/4-5-6 housing (422).
  • Inspect for leaking or damaged 4-5-6 piston dam (435).