The "A" clutch in ZF8HP55, ZF8HP70 and ZF8HP75 transmissions has a thin, stamped OE backing plate that allows flexing and bowing (coning) of the clutch pack. This wears the clutches unevenly, generating and concentrating extra heat which leads to clutch burnup. The result is slipping or no 1st/2nd, 7th/8th and Reverse Gears and ratio codes. Sonnax heavy duty “A” clutch backing plate 35577-70 is designed to prevent flexing when the clutch is applied, eliminating the leading cause of "A" clutch failure.

2X thicker than weak, stamped OE backing plate for significantly improved protection against burnup
Easy to install, no special tools or machining required
Prevents comebacks by installing in units that have not yet failed

More From This Category

Sonnax Turbine Hub, GM, Perf. Kit GM-Rk-11, 10in. 4L60&E, Each

Sonnax Turbine Hub, GM, Perf. Kit GM-Rk-11, 10in. 4L60&E, Each

$102.63

Sonnax Tool Kit, Ford, AOD/E, 4R70E/W, 4R75E/W, 4L30E, Each

Sonnax Tool Kit, Ford, AOD/E, 4R70E/W, 4R75E/W, 4L30E, Each

$2,871.44

Sonnax Seal Ring, Mb 722.9 (222), Each

Sonnax Seal Ring, Mb 722.9 (222), Each

$16.67

Sonnax Special Order Ring Gear, Oe 12312-61A00, Demand Only, Each

Sonnax Special Order Ring Gear, Oe 12312-61A00, Demand Only, Each

$51.48

Sonnax Valve Body Retainer Plate Kit, Ford, 4R70E/W, 4R75E/W '01-Later, Each

Sonnax Valve Body Retainer Plate Kit, Ford, 4R70E/W, 4R75E/W '01-Later, Each

$35.64

Sonnax Band Anchor Strut, GM, Powerglide, Each

Sonnax Band Anchor Strut, GM, Powerglide, Each

$77.17