Symptoms:

  • No lockup
  • No TCC release
  • Engine stall
  • TCC codes
  • Excess TCC slip
  • Premature TCC apply
  • Soft TCC apply
  • Harsh TCC apply

Cause:

Bore wear at the TC switch valve allows pressure loss that leads to drivability concerns.

Correction:

Recover hydraulic control and renew TCC performance by reconditioning the bore and installing Sonnax oversized TC switch valve.

845RE, ZF8HP45, ZF8HP55, ZF8HP70

Oversized TC Switch Valve
Part No. 35740-05

ZF valve name: SV-WD
Chrysler valve name: SV-TC


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

Vehicles equipped with Chrysler 845RE and ZF8HP45, ZF8HP55 and ZF8HP70 transmissions may display concerns such as no lockup, excess TCC slip, soft or harsh apply and TCC codes. In some cases, engine stall can occur due to TCC being stuck in the apply position. These problems can be caused by bore wear at the TC switch valve, which allows crucial pressure loss from the circuit. Reconditioning the bore and installing Sonnax oversized TC switch valve 35740-05 brings the TCC switch circuit back under control by eliminating the path for fluid escape.

  • Annular grooves help center valve in bore to reduce side-load wear
  • Hardcoat anodized aluminum valve combats premature wear

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 Valve Body Layout

ZF8HP45, ZF8HP70 Valve Body Layout

ZF8HP45, ZF8HP70 Valve Body Layout
  • 845RE, ZF8HP45, ZF8HP55, ZF8HP70 Oversized TC Switch Valve 35740-05

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 TC Switch Valve Vacuum Test Locations