Symptoms:

  • Lost, damaged or modified original valve
  • Code 628, 1741
  • TCC apply concerns

Cause:

Debris and constant oscillation of the converter clutch regulator valve can create scratches on the critical valve spools.

Correction:

Sonnax offers a direct replacement TCC regulator valve, which may be used either in the original casting bore or in conjunction with the Sonnax 37947-09K sleeve when the bore cannot be salvaged with an OE-diameter valve.

4R44E, 4R55E, 5R44E, 5R55E

TCC Regulator Valve
Part No. 37947-38

OE size

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

Debris and constant oscillation of the converter clutch regulator valve can create scratches on the critical valve spools, allowing valuable regulated line pressure to leak and setting 628 and 1741 codes. Excessive spool scratches also make the valve unsuitable for use with Sonnax TCC regulator sleeve kit 37947-09K. Sonnax direct replacement TCC regulator valve 37947-38 may be used in the original casting bore or with the Sonnax 37947-09K sleeve when the bore cannot be salvaged with an OE-diameter valve.

  • Valve may be used with original OE casting
  • Valve may also be used with Sonnax 37947-09K sleeve kit
  • Hardcoat anodized valve prevents scratching on critical spools
  • 4R44E, 4R55E, 5R44E, 5R55E TCC Regulator Valve 37947-38
  • 4R44E, 4R55E, 5R44E, 5R55E TCC Regulator Valve 37947-38

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.

4R44E, 4R55E, 5R44E, 5R55E TCC Regulator Valve Vacuum Test Locations