sonnax-black Facebook-color LinkedIn-color maillink printlink r_and_r_only SERVOFIX-logo-web Twitter-color VBFIX-logo-web video-logo-web warranty_only Youtube-color


  • B Clutch breakage
  • Erratic line pressure
  • Poor shift quality
  • Delayed Reverse
  • No Reverse


Excessive valve and bore clearance due to wear.


The Sonnax oversized valve kit restores correct valve-to-bore clearances and circuit integrity as well as preventing future wear in this area.


Oversized Pressure Regulator Valve Kit
Part No. 139740-01K

You need this if... View Instructions

Wear is commonly found at different areas in the ZF5HP24 pressure regulator valve bore. Wear at the inner portion of the bore causes high pressure spikes leading to broken drums, pistons or other parts, as well as restricting converter/lubrication flow. Wear at the spring end of the bore allows line pressure to exhaust resulting in low line pressure, soft shifts and burnt clutches. The Sonnax oversized pressure regulator valve kit 139740-01K restores valve-to-bore clearances so the pressure regulator valve can maintain correct pressures.

  • Annular oil grooves support the valve and reduce wear rate.
  • Restores valve-to-bore clearances maintaining correct pressures.
  • Valve
  • Spring
  • 139740 01k combo
  • 139740 01k

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.

  • 139740 01k test