• Bump shifts
  • Burnt clutches
  • Flare shifts
  • Gear loss
  • Gear ratio & solenoid codes


Bore wear at a clutch holding valve allows pressure escape that causes driveability problems.


Stop pressure loss and restore normal clutch action by reconditioning the bore and installing Sonnax oversized clutch holding valve kit. 

845RE, ZF8HP45, ZF8HP55, ZF8HP70

Oversized Clutch Holding Valve Kit
Part No. 35740-20K

Fits five separate locations. Clutch holding valve locations HV-C and HV-E use an end plug, the HV-A, HV-D and HV-B1 locations do not.

You need this if... View Instructions Find a Distributor

The Chrysler 845RE and ZF8HP45/55/70 clutch holding valves provide solenoid feedback pressure to the clutch control valves, balancing each control valve to assist with apply and release of the respective clutch. Excess wear at a clutch holding valve bore allows crucial fluid to escape the circuit. This can cause shift timing problems, a burnt clutch, ratio and solenoid codes, or loss of gears. Reconditioning the bore and installing Sonnax oversized clutch holding valve kit 35740-20K eliminates bore wear and stops leakage for renewed clutch operation.

  • Hardcoat anodized valve combats premature wear
  • Annular grooves help center the valve in the bore to resist wear
  • Valve
  • Spring
  • End plug
  • O-Rings (3) 1 Extra

Sonnax valve body layouts provide a detailed overview of individual units making it quick and easy to determine what’s available for the specific valve body you’re working on. See all Sonnax valve body layouts.

ZF8HP55 Valve Body Layout

Zf8hp55 vbl thumb

ZF8HP45, ZF8HP70 Valve Body Layout

Zf8hp45 70 vbl thumb
  • 35740 20k combo
  • 35740 20k
  • 35740 20k zf8hp45 70 locations
  • 35740 20k zf8hp55 locations

You need this if...

Vacuum testing at the port(s) indicated fails to hold the recommended minimum in-Hg, or if wear is visually detected.

  • 35740 20k in test1
  • 35740 20k in test2
  • 35740 20k in test3
  • 35740 20k in test4