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  • Bushing failure
  • Overheated fluid & TCC lining
  • High line pressure in Reverse
  • Low line rise in Drive
  • Low line rise in Reverse


Wear at the inner bore results in excess pressure and reduced cooler/converter flow. Boost sleeve wear allows oil loss, resulting in poor line rise.


This oversized pressure regulator valve and boost assembly allows the valve body bore to be restored to normal operating condition.

09G, 09K, 09M, 6F21WA, TF-60SN

Oversized Pressure Regulator Valve & Boost Valve Kit
Part No. 15741-01K

You need this if... View Instructions

Vehicles equipped with 09G,09K,09M, 6F21WA, TF60SN transmissions often develop erratic or high line pressure due to excessive wear in the OE pressure regulator valve bore and/or boost valve and sleeve. This wear allows critical oil loss, preventing proper line pressure regulation. Without correct balance oil pressure, the PR valve will be out of its desired position, resulting in line pressure instability and possibly restricting cooler and lube flow to the secondary regulator valve. A deteriorated bore can cause lowered line pressure, resulting in soft shifting and burnt clutches.
Reconditioning the bore and installing Sonnax oversized pressure regulator valve and boost valve kit 15741-01K restores proper line pressure and cooler flow.

  • Pressure Regulator Valve
  • Pressure Regulator Spring
  • Boost Sleeve
  • Boost Valve

Sonnax valve body layouts provide a detailed overview of individual units making it quick and easy to determine what’s available for the specific valve body you’re working on. See all Sonnax valve body layouts.

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  • 15741 01k combo
  • 15741 01k  1

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.