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.
Contact a Sonnax Parts Distributor.
The accumulator cover has burrs or damaged and worn OE piston stops (Figure 1).