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Symptoms:
  • Code P0741
  • Damaged valve body casting
  • Low spring rate on 2.3L TCC regulator valve
  • Low TCC apply pressure
Cause:

Incorrect spring rate for the TCC regulator valve.

Correction:

Recalibrate TCC apply to 4.0L rate.

4R44E, 4R55E, 5R44E, 5R55E

TCC Regulator Valve Spring Kit

Part No.

37947-46K

TCC Regulator Valve Spring Kit
  • 37947-46k_combo

  • TCC Regulator Valve Spring Kit

Small_37947-46k_combo Small_37947-46k

4R44E, 4R55E, 5R44E, 5R55E

TCC Regulator Valve Spring Kit

Part No. 37947-46K

  • Outer Springs (5) White
  • Inner Springs (5) Plain

Complaint:

  • Code P0741
  • Damaged valve body casting
  • Low spring rate on 2.3L TCC regulator valve
  • Low TCC apply pressure

Cause:

Incorrect spring rate for the TCC regulator valve.


Correction:

Recalibrate TCC apply to 4.0L rate.

The 2.3L TCC regulator valve has a lower spring rate and lower apply pressure than the 4.0L. If the incorrect core is installed or the springs have been damaged, the TCC apply pressure is reduced and slippage occurs. The springs in the Sonnax kit 37947-46K have been designed to match the 4.0L calibration. The kit can be used to replace weak, broken or lost springs in 4.0L applications or to convert a 2.3L valve body core for use in a 4.0L application.

  • Direct replacement 4.0L springs salvage or upgrade the valve body.
  • Spring kit allows conversion of 2.3L valve body to 4.0L application.
NOTE:

Not recommended for usage in 2.3L applications as firmer apply will result.

Valve Body Layouts

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.

Valve Body Layout Ford 4R/5R44E, 4R/5R55E
Contact a Sonnax Distributor to purchase this part.