Sonnax®

Heavy Duty Billet Steel "D" Clutch Backing Plate

ZF8HP55 ZF8HP70 ZF8HP75

2012-2022

The “D” 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 4th through 8th and Reverse Gears, as well as ratio codes. Sonnax® heavy duty “D” clutch backing plate 35570-75 is designed to prevent flexing when the clutch is applied, eliminating a leading cause of “D” 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

Prevent comebacks by installing in units that have not yet failed

Symptoms:

"D" Clutch burned

Reverse slip

No Reverse

Gear ratio codes

Slipping gears

Cause:

The weak OE "D" clutch backing plate allows major flex that causes irregular clutch wear and burning.

Correction:

Eliminate the flexing that leads to comebacks by installing the thicker, stiffer Sonnax heavy duty "D" clutch backing plate.

Specs

Material: Billet Steel