Symptoms:
- Worn accumulator piston pin bore
- Soft & inconsistent shift feel
- 1-2 Flare
- 2-3 Flare
- 2nd Slip
- 3rd Slip
- 2nd Clutch burned (GM)
- 3rd Clutch burned
- No 2nd
- No 3rd
Cause:
Excess wear at accumulator piston pin bore allows circuit pressure to escape.Correction:
Recover hydraulic control and renew shift feel and performance by reconditioning the pin bore and installing Sonnax oversized accumulator pin.Warning:
Sonnax oversized accumulator piston and reamer kit 84573-02K is no longer in production. Check with your distributor for availability.
4T60, 4T60-E
Oversized Accumulator Pin
Part No. 84573-01K
Fits 1-2 and 2-3 accumulator locations only
Package Quantity: 4
-
Tooling:
- 84573-02K
View Instructions Find a Distributor
GM 4T60 and 4T60-E units commonly display negative shift characteristics that can be traced to excess wear at the 1-2 and 2-3 accumulator piston pin bores. Slipping, flares, and soft or inconsistent shifts often result, followed by burnt 2nd and 3rd clutches. Extreme cases will cause a loss of 2nd, 3rd and/or 4th Gears. Restore hydraulic control and banish sloppy shifting by reconditioning the pin bore and installing Sonnax oversized accumulator pin 84573-01K.
- Salvages accumulator pistons
- Oversized pin creates tight hydraulic seal with OE piston
- Starter kit 84573-02K includes reamer for boring piston pin bore
