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  • B2 Brake clutches burned
  • Delayed Reverse
  • Low line rise in Reverse
  • K3 Clutch burned


Continual boost valve stroking results in sleeve bore wear and loss of Reverse pressure.


Installing Sonnax boost valve and sleeve restores critical tolerances to bring back normal operating conditions.

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

Boost Valve Kit
Part No. 15741-51K

You need this if... View Instructions

The boost sleeve in listed units wears from repeated oscillation of the boost valve, allowing Reverse pressure to exhaust. This will result in delayed Reverse, low line pressure in Reverse and/or burnt K3 and B2 brake clutches. Sonnax boost valve kit 15741-51K eliminates these concerns and restores proper hydraulic control.

  • Valve
  • Sleeve

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.

Aisin AW TF-60SN Valve Body Layout

Tf 60sn vbl thumb

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  • 15741 51k combo
  • 15741 51k

You need this if...

A vacuum test at the port indicated fails to hold at least 18 in-Hg.

  • 15741 51k test