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Other Part Number: S46507A

Manufacturer Part Number: 144510-15K

Brand: Sonnax

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

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
  • Valve
  • Sleeve


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

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