March 21, 2013
Symptoms:
- 1-2 Quality poor
- Flare shifts
- Soft shifts & poor line rise
Cause:
Wear at the 1-2 accumulator valve and/or bore, allowing loss of torque signal, 1-2 accumulator and/or line pressure.Correction:
Recondition the worn bore and install Sonnax oversized 1-2 accumulator valve to restore correct hydraulic clearances.4T65-E
Oversized 1-2 Accumulator Valve
Part No. 84754-57K
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Tooling:
- F-84754-TL57
- VB-FIX
You need this if... View Instructions Find a Distributor
To help control the 2nd clutch apply pressure and shift feel in the GM 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.
Recondition the bore and install Sonnax oversized 102 accumulator valve 84754-57K to restore hydraulic integrity.
- Hardcoat anodized aluminum valve combats premature wear
- Can be used in either early- or late-style valve bodies
- Annular grooves help center valve in bore to reduce future side-load wear
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
