July 14, 2021

How to Prevent ZF8, 845RE, 850RE "A" Clutch Failure

Presented by Sonnax

Learn why "A" clutch burnup is a chronic problem with ZF8 and Chrysler 845RE, 850RE transmissions, plus how to easily repair and prevent failure with a Sonnax heavy duty "A" clutch backing plate. In this video, you'll see firsthand how badly the weak OE backing plate flexes during apply. This is the underlying cause of uneven clutch wear and excessive heat buildup in the clutch pack. Then, watch how replacing the OE plate with the thicker, stiffer Sonnax plate significantly improves "A" clutch apply — critical for long-term reliability in any build.

Two upgraded Sonnax plates are available:

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