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Home >> GMC >> 2016 >> Terrain SL, Gas >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 5 (Automatic Transmission - 6T70 (M7U M7W) - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> Harsh First and Reverse Shift

Harsh First and Reverse Shift

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Checks Causes
Case Cover Assembly (403) Inspect for plugged or improperly positioned low and reverse piston (408) air bleed.
Low and Reverse Clutch
  • Inspect for improper surface finish on low and reverse clutch plates (449-453).
  • Inspect for damaged or worn low and reverse clutch plates (452).
  • Inspect for damaged low and reverse clutch backing plate (453).
  • Inspect for worn splines on backing plate (453).
  • Inspect for damaged low and reverse clutch piston assembly (408), spring (409), and spring retaining ring (410).
  • Inspect for fatigued or binding low and reverse clutch piston return spring (409).
  • Inspect for broken low and reverse clutch wave plate (449).
Lower Valve Body Inspect for stuck 4-5-6 clutch boost valve.