Symptoms:

  • Code P0776
  • Flare shifts
  • Harsh Reverse
  • No Reverse
  • 2-3 Harsh
  • No 3rd
  • 4-5 Harsh
  • No 5th

Cause:

When the OE 3-5-R waved plate breaks, broken pieces damage 3-5-R clutch housing splines.

Correction:

Save the housing and restore normal operation by installing Sonnax 3-5-R drum saver kit.

6T40 (Gen. 1), 6T40 (Gen. 2), 6T45 (Gen. 2), 6T45 (Gen.1), 6T50 (Gen. 1), 6T50 (Gen. 2)

3-5-R Drum Saver Kit
Part No. 144555K

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The 3-5-R waved plate in GM Gen. 1 and 2 6T40, 6T45, 6T50 units commonly fails and breaks into pieces, resulting in code P0776, harsh and flare shifts or complete loss of 3-5-R. Additionally, the broken pieces damage the housing splines, requiring a new housing. Even though the OEM attempted to prevent this issue with an updated waved plate, there are still units with the updated plates failing in the field. Sonnax 3-5-R drum saver kit 144555K is specially designed to allow salvage of the damaged housing by preventing the damaged spline portion from interfering with proper clutch pack travel.

  • Precision-machined, billet cupped steel plate restores stack height and centers waved plate
  • Better than OE-quality, shot-peened, stress-relieved waved plate designed to operate without interference from damaged housing splines
  • Sonnax kit can be used to restore normal operation or on an undamaged housing to prevent failure
  • Cupped Steel Plate
  • Waved Plate
  • 6T40 (Gen. 1), 6T40 (Gen. 2), 6T45 (Gen. 2), 6T45 (Gen.1), 6T50 (Gen. 1), 6T50 (Gen. 2) 3-5-R Drum Saver Kit 144555K
  • 6T40 (Gen. 1), 6T40 (Gen. 2), 6T45 (Gen. 2), 6T45 (Gen.1), 6T50 (Gen. 1), 6T50 (Gen. 2) 3-5-R Drum Saver Kit 144555K details