In GM 4L60-E, 4L65-E and 4L70-E units, it is common for the plastic Forward accumulator piston to wear or crack and older aluminum piston bores to wear from repeated reciprocation. This causes a loss of fluid, resulting in delayed engagement, slips, burnt clutches and/or bands. Sonnax aluminum Forward accumulator piston 74927-AP eliminates the cracking problem and restores hydraulic integrity at the pin bore. The drop-in Zip Valve™ part installs quickly and easily.
Learn More About Zip Valve™ Drop-In Repairs

More From This Category

Sonnax Line Pressure Booster Kit, Chrysler, 45/545RFE, 65/66/68RFE, Each

Sonnax Line Pressure Booster Kit, Chrysler, 45/545RFE, 65/66/68RFE, Each

$125.79

TCI Kit Overhaul Racing 68-Later GM TH350

TCI Kit Overhaul Racing 68-Later GM TH350

$149.69

TCI Transmission Band, KEVLAR , For Ford, C-4, Intermediate, Set

TCI Transmission Band, KEVLAR , For Ford, C-4, Intermediate, Set

$81.32

Motive Gear Axle Shaft, 28SPL, 14.96 in. Length, For CHEVROLET AVALANCHE 1500 2004–2006, Each

Motive Gear Axle Shaft, 28SPL, 14.96 in. Length, For CHEVROLET AVALANCHE 1500 2004–2006, Each

$210.26