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Symptoms:

  • 1-2 Flare
  • 2-3 Flare
  • 2nd Clutch burned (GM)
  • 2nd Slip
  • 3rd Clutch burned
  • 3rd Slip
  • No 2nd
  • No 3rd
  • No 4th
  • Soft & inconsistent shift feel

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.

4T60, 4T60-E

Oversized Accumulator Pin & Reamer Kit
Part No. 84573-02K

Fits 1-2 and 2-3 accumulator locations only

View Instructions

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 84573-02K.

  • Salvages accumulator pistons
  • Oversized pin creates tight hydraulic seal with OE piston
  • Replacement pin kit 84573-01K includes four oversized pins
  • Pins (10)
  • Reamer

September 30, 2005

Anatomy of a Transmission: Oil Flow in the Pump-PR-Converter-Cooler Lube Circuits

Gregg Nader

Topics: Diagnostics And Theory Transmission

Read Now
  • 84573 02k combo
  • 84573 02k