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
• Prevent comebacks by installing in units that have not yet failed

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

The "D" clutch in ZF8HP45, ZF8HP50, Chrysler 845RE and 850RE 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. Sonnax heavy duty "D" clutch backing plate 35570-50 is two times thicker than the OE plate which prevents flexing when the clutch is applied, and provides greater durability. 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