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  • Soft shifts & poor line rise
  • 1-2 Long
  • Flare shifts


Wear at the 1-2 accumulator valve and/or bore, allowing loss of torque signal, 1-2 accumulator and/or line pressure.


Refurbish the worn bore and install the Sonnax oversized valve to restore correct hydraulic clearances.


Required tool kit F-84754-TL57 is no longer in production. Check with your distributor for availability.


Oversized 1-2 Accumulator Valve
Part No. 84754-57K

Fits GM and Volvo applications.

You need this if... View Instructions

To help control the 2nd clutch apply pressure and shift feel in the 4T65-E, a 1-2 accumulator piston and accumulator valve regulating fluid pressure are used. The 1-2 accumulator valve regulates line pressure using torque signal influence and directs 1-2 accumulator pressure to the spring side of the piston, controlling the 2nd clutch apply. Wear at the bore or valve can allow torque signal, 1-2 accumulator or line pressures to exhaust, resulting in various 1-2 shift complaints. The oversized Sonnax valve is made from wear-resistant, hard-coat anodized aluminum to prevent future wear in a refurbished bore. Annular grooves have been added to the valve spool to hydraulically center the valve in the bore for wear resistance.

  • Valve is hard-coat anodized to prevent wear
  • Can be used in either early- or late-style valve bodies.
  • Annular grooves added for hydraulic centering and wear reduction

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.

GM 4T65-E Valve Body Layout

Gm 4t65 e thumb

March 21, 2013

GM 4T65-E Vacuum Test Guide

Topics: Vacuum Test Guides Vacuum Testing Transmission GM 4T65-E Transmission

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  • 84754 57k combo
  • 84754 57k

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.

  • 84754 57k in test