Symptoms:

  • Harsh shifts
  • Erratic line pressure
  • Broken parts due to excessive line pressure
  • High line pressure
  • Burnt clutches
  • Restricted converter/lube flow
  • Soft shifts

Cause:

Excess pressure regulator bore wear allows fluid loss, preventing normal line pressure control.

Correction:

Restore appropriate line pressure in all ranges by reconditioning the bore and installing wear-resistant Sonnax oversized pressure regulator valve kit.

45RFE, 545RFE, 65RFE, 66RFE, 68RFE

Oversized Pressure Regulator Valve Kit
Part No. 44912-10K


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

Vehicles equipped with Chrysler 45RFE, 545RFE, 65RFE, 66RFE and 68RFE transmissions can develop erratic or high line pressure due to excessive wear in the OE pressure regulator valve bore. This wear allows critical oil loss, preventing correct line pressure regulation. Without adequate balance oil pressure, the PR valve will be out of its desired position, resulting in line pressure instability and possibly restricting cooler and lube flow. A deteriorated bore can cause lowered line pressure, resulting in soft shifting and burnt clutches. Reconditioning the bore and installing Sonnax oversized pressure regulator valve kit 44912-10K restores pressure regulator action for line pressure control in all ranges.

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

Spring Selection Chart

Spring Usage Function
Green Spring OE Pressures
Yellow Spring Sonnax RFE-LB1

  • Valve
  • Spring Yellow
  • Spring Green

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.

Chrysler 45RFE, 545RFE, 65RFE, 66RFE, 68RFE Valve Body Layout

Chrysler 45RFE, 545RFE, 65RFE, 66RFE, 68RFE Valve Body Layout
  • 45RFE, 545RFE, 65RFE, 66RFE, 68RFE Oversized Pressure Regulator Valve Kit 44912-10K
  • 45RFE, 545RFE, 65RFE, 66RFE, 68RFE Oversized Pressure Regulator Valve Kit 44912-10K

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.

45RFE, 545RFE, 65RFE, 66RFE, 68RFE Oversized Pressure Regulator Valve Kit Vacuum Test Locations