Symptoms:

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

Cause:

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

Correction:

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 35740-20K
  • 845RE, ZF8HP45, ZF8HP55, ZF8HP70 Oversized Clutch Holding Valve Kit 35740-20K
  • 845RE, ZF8HP45, ZF8HP55, ZF8HP70 Oversized Clutch Holding Valve Kit 35740-20K details
  • 845RE, ZF8HP45, ZF8HP55, ZF8HP70 Oversized Clutch Holding Valve Kit 35740-20K details

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.

845RE, ZF8HP45, ZF8HP55, ZF8HP70 Oversized Clutch Holding Valve Kit Vacuum Test Locations
845RE, ZF8HP45, ZF8HP55, ZF8HP70 Oversized Clutch Holding Valve Kit Vacuum Test Locations
845RE, ZF8HP45, ZF8HP55, ZF8HP70 Oversized Clutch Holding Valve Kit Vacuum Test Locations
845RE, ZF8HP45, ZF8HP55, ZF8HP70 Oversized Clutch Holding Valve Kit Vacuum Test Locations