December 07, 2016
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:
- Part #35577-70 Fits ZF8HP55, ZF8HP70, ZF8HP75
- Part #35577-45 Fits ZF8HP45, ZF8HP50, ZF8HP51 & Chrysler 845RE, 850RE
Learn More
September 06, 2016
ZF8HP45/70 Valve Body Layout
Related Units
Related Parts
Required
Recommended
ZF8HP55, ZF8HP70, ZF8HP75
Heavy Duty "A" Clutch Backing Plate 35577-70
- Material: Billet Steel
-
Helps cure:
- No Reverse
- Reverse slip
- "A" Clutch burned
- Gear ratio codes
- Slipping gears
While Sonnax makes every effort to ensure the accuracy of technical articles at time of publication, we assume no liability for inaccuracies or for information which may become outdated or obsolete over time.