Symptoms:

  • Low line pressure
  • Line pressure instability
  • Shift concerns
  • Burnt clutches

Cause:

Pressure regulator isolator sleeve and valve wear results in poor line pressure regulation.

Correction:

Recover hydraulic control and renew line pressure performance by installing Sonnax drop-in pressure regulator isolator valve kit.

6T31 (Gen. 3 6T40), 6T35 (Gen. 3 6T40), 6T41 (Gen. 3 6T40), 6T46 (Gen. 3 6T40), 6T51 (Gen. 3 6T40)

Pressure Regulator Isolator Valve Kit
Part No. 144510-15K

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

Vehicles with listed GM Gen. 3 6T40 transmissions may exhibit no line rise or low line pressure due to excess wear in the pressure regulator isolator valve assembly. The pressure regulator isolator valve reacts against the pressure regulator valve, controls balance pressure, and dampens and smooths pressure pulses from the pressure control solenoid. Excess wear can lead to undesirable shift operation and burned clutches. Installing Sonnax pressure regulator isolator valve kit 144510-15K restores proper line pressure control for renewed shift feel and performance.

  • Sleeve manufactured from highly wear-resistant aluminum
  • Hardcoat anodized aluminum valves combat premature wear
  • Annular grooves help center valve in sleeve to reduce future side-load wear
  • Drop-in Zip Valve parts install quickly and easily
Learn More About Zip Valve™ Drop-In Repairs
  • Valve
  • Sleeve
  • 6T31 (Gen. 3 6T40), 6T35 (Gen. 3 6T40), 6T41 (Gen. 3 6T40), 6T46 (Gen. 3 6T40), 6T51 (Gen. 3 6T40) Pressure Regulator Isolator Valve Kit 144510-15K
  • 6T31 (Gen. 3 6T40), 6T35 (Gen. 3 6T40), 6T41 (Gen. 3 6T40), 6T46 (Gen. 3 6T40), 6T51 (Gen. 3 6T40) Pressure Regulator Isolator Valve Kit 144510-15K

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.

6T31 (Gen. 3 6T40), 6T35 (Gen. 3 6T40), 6T41 (Gen. 3 6T40), 6T46 (Gen. 3 6T40), 6T51 (Gen. 3 6T40) Pressure Regulator Isolator Valve Kit Vacuum Test Locations