Symptoms:

  • TCC codes
  • TCC apply & release concerns
  • Converter shudder
  • Burnt converter

Cause:

TCC regulator valve bore wear allows loss of crucial apply pressure.

Correction:

Recover hydraulic control and renew TCC performance by reconditioning the bore and installing Sonnax oversized TCC regulator valve kit.
  • 4L80-E, 4L85-E Oversized TCC Regulator Valve Kit 34994-18K
  • 4L80-E, 4L85-E Oversized TCC Regulator Valve Kit 34994-18K
  • 4L80-E, 4L85-E Oversized TCC Regulator Valve Kit 34994-18K details

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.

4L80-E, 4L85-E Oversized TCC Regulator Valve Kit Vacuum Test Locations