Symptoms:

  • 3-4 Concerns
  • Soft shifts & poor line rise

Cause:

Wear at the 3-4 accumulator valve and/or bore, allowing loss of torque signal, 3-4 accumulator and/or line pressure.

Correction:

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

Warning:

Required tool kit F-84754-TL55 is no longer in production. Check with your distributor for availability.

4T65-E

Oversized 3-4 Accumulator Valve Kit
Part No. 84754-55K

GM units only


You need this if... View Instructions Find a Distributor

To help control the 4th clutch apply pressure and shift feel, a 3-4 accumulator piston and an accumulator valve regulating fluid pressure are used. The 3-4 accumulator valve regulates line pressure using torque signal influence, and directs 3-4 accumulator pressure to the spring side of the piston, controlling the 4th clutch apply. Wear at the bore or valve can allow torque signal, 3-4 accumulator or line pressures to exhaust, resulting in various 3-4 shift complaints.

Reconditioning the bore and installing Sonnax oversized accumulator valve kit 84754-55K restores correct hydraulic clearance and shift control in GM units. For Volvo units, Sonnax offers 84754-58K.

  • Hardcoat anodized valve combats premature wear
  • Lengthened valve spool for better hydraulic sealing and stability
  • Annular grooves hydraulically center the valve to reduce wear
  • Valve
  • Spring

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 Valve Body Layout
  • 4T65-E Oversized 3-4 Accumulator Valve Kit 84754-55K
  • 4T65-E Oversized 3-4 Accumulator Valve Kit 84754-55K

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.

4T65-E Oversized 3-4 Accumulator Valve Kit Vacuum Test Locations