4L60E, 4L65E, 4L70E Sonnax Pinless Accumulator Piston Kit FWD (1-2 & 3-4)
Symptoms:
Aluminum pistons wear at the pin bore
Burnt bands
Burnt clutches
Cracked pistons
Delayed engagement
Forward Slip
Cause: Wear at the piston pin bore due to repeated reciprocation and/or cracks in the plastic accumulator piston. Use of the Sonnax part eliminates the need for the pins. The Sonnax patented pinless design with dual seals stabilizes the piston in the bore and provides improved sealing characteristics.
Correction: The Sonnax kit's dual seals stabilizes and completely seals the piston in the bore.
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