Symptoms:

  • Code 28, 1744, 1740
  • High line pressure
  • Cracked drum
  • Planetary failure
  • Bushing failure
  • Loss of lube oil
  • No cooler flow during failsafe

Cause:

Worn casting bores at the pressure regulator and converter regulator valves, and insufficient cooler and converter flow.

Correction:

The oversized PR valve restores the balance circuit to correct high line pressure and guards against excess EPC/TV pressure. The PR valve and converter regulator valve have modifications to properly regulate converter and cooler flow.

CD4E, LA4A-EL

Master Kit
Part No. 73840-MK


View Instructions Find a Distributor

The CD4E transmission frequently exhibits such symptoms as lube failure, harsh shifts and line pressure instability as well as a variety of TCC Lockup issues. Sonnax master kit 73840-MK contains both the Regulator Kit 73840-RK and the Bypass Kit 73840-BK to address issues in both areas. See the individual kits for more detail.

Both the Regulator and Bypass Kits require reaming for installation. See options below:

Rearmer kit 73840-RTL is no longer in production but may be available from distributor inventory. F-73840-TL is available for use prior to installation of 73840-RK.

  • 73840-RK
  • 73840-BK

  • CD4E, LA4A-EL Master Kit 73840-MK
  • CD4E, LA4A-EL Master Kit 73840-MK