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Brand: Sonnax

Other Part Number: S74937-1K

Type: Transmission Case Repair

Interchange Part Number: S74927AK

Manufacturer Warranty: Yes

Items Included: Accumulator Sleeve, Piston with O-Ring, Pin

Manufacturer Part Number: 77998-01K

Universal Fitment: Yes

Vintage Part: No

Performance Part: No

4L60, 4L60-E, 4L65-E, 4L70-E Transmission Case Saver

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

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.

  • Sleeve is manufactured from wear-resistant aluminum
  • Requires no machining of the transmission case
  • Sleeve
  • Piston
  • O-Ring Fluorocarbon
  • Accumulator Pin

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