Sonnax®

"D" Clutch Hub

ZF8HP70 ZF8HP75

2012-2022

The “D” clutch hubs in ZF8HP55, ZF8HP70 and ZF8HP75 transmissions are made from weak, cast A383 aluminum. Over time, the steel core of the clutch plates wear through the splines on the hub, causing failure. Wear can appear after just a few thousand miles, often resulting in burnt clutches. Additionally, the backing plate tends to flex, causing uneven wear on the clutch friction material. These issues lead to a high failure rate, sometimes even within the OE warranty period, and can cause loss of 4^th through 8^th Gears and Reverse.

Sonnax® "D" clutch hub 35570-70K is a riveted two piece assembly that provides a steel hub that prevents wear from the steel core of the clutch plates. This new hub also is fitted with a new bushing and is ready to install.

Riveted two piece assembly

Steel hub prevents wear from the steel core of the clutch plates

Fitted with new bushing

Symptoms:

"D" Clutch burned

No Reverse

No 4th

No 5th

No 6th

No 7th

No 8th

Cause:

The weak OE "D" clutch hub wears due to the steel clutch plates.

Correction:

Installing Sonnax® steel "D" clutch hub prevents wear from the steel core of the clutch plates.