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Symptoms:

  • Damaged 2nd clutch piston seal
  • Damaged 3rd clutch piston seal
  • Wear & damage in accumulator cover

Cause:

OE design allows angled contact between accumulator pistons and covers, creating aluminum burrs which break free and cause accumulator and clutch piston seal damage.

Correction:

This Sonnax piston stop is an easily installed kit that provides a positive stop for the 1-2 and 2-3 accumulator pistons.

4T65-E

Accumulator Piston Stop Kit
Part No. 84528-01K

You need this if... View Instructions

Angled contact between accumulator pistons and covers generate aluminum burrs on the 4T65-E accumulator housing cover. The aluminum burrs can break free and cause damage to accumulator piston seals and 2nd and 3rd clutch piston seals. Removing existing burrs or installing a new cover does not prevent additional burrs from being created or breaking free. The Sonnax accumulator piston stop kit 84258-01K is an easily installed upgrade that provides a positive stopfor the pistons and prevents burrs from being generated.

  • Eliminates generation of metal burrs in clutch oilcircuits
  • Simple installation, no special tools required
  • Salvages accumulator covers
  • Piston Stops (2)
  • Button Head Cap Screws (4)
  • 84528 01k combo
  • 84528 01k

You need this if...

The accumulator cover has burrs or damaged and worn OE piston stops (Figure 1).

  • 84528 01k test