Transmission Parts GM 4L70-E 4L60 4L60-E 4L65-E Case Valve / Sleeve

Symptoms:

Case damage
Scored accumulator bores
Worn accumulator bores

Cause:

Repeated oscillation of the accumulator piston scores the 3-4 accumulator bore during normal operation.

Correction:

Sonnax 3-4 accumulator sleeve kit comes with an aluminum sleeve, a replacement piston with an O-ring, and a new accumulator pin. It is compatible with all OE accumulator springs.

4L60, 4L60-E, 4L65-E, 4L70-E

3-4 Accumulator Sleeve Kit
Part No. 77998-01K

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The 3-4 accumulator bore on GM 4L60 and 4L60-E series cases can become scored, resulting in the loss of 4th servo feed and 4th accumulator pressure. Scoring is caused by repeated oscillation of the accumulator piston within the bore during normal operation. Once this bore is damaged, the case must be scrapped. Sonnax 3-4 accumulator sleeve kit 77998-01K counteracts bore wear and features upgraded materials for greater durability. The kit's piston is compatible with all OE accumulator springs.