Symptoms:

  • Harsh shifts
  • Soft shifts
  • Solenoid performance codes

Cause:

Bore wear can cause excess leakage in the actuator feed limit circuit which can affect solenoid function resulting in various drivability issues

Correction:

Restore hydraulic control by reconditioning the bore and installing Sonnax oversized accumulator pistons.

6T70 (Gen. 1), 6T75 (Gen. 1)

Oversized Actuator Feed Accumulator Piston Kit
Part No. 124740-40K


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

GM 6T70 (Gen. 1) and 6T75 (Gen. 1) units often suffer shift abnormalities caused by excess wear in the actuator feed accumulator piston bores. This wear allows actuator feed limit fluid loss which prevents proper regulation of oil pressure supplied to control solenoids, resulting in harsh or soft shifts, solenoid codes and clutch failure.

Reconditioning the bore and installing Sonnax oversized actuator feed accumulator piston kit 124740-40K re-establishes correct clearance for revived shift control in all ranges.

  • Hardcoat anodized aluminum valve combats premature wear
  • Spring calibrated to match OE function
  • Accumulator Pistons (3)
  • Springs (3)

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 Gen. 1 6T70, 6T75 Valve Body Layout

GM Gen. 1 6T70, 6T75 Valve Body Layout
  • 6T70 (Gen. 1), 6T75 (Gen. 1) Oversized Actuator Feed Accumulator Piston Kit 124740-40K
  • 6T70 (Gen. 1), 6T75 (Gen. 1) Oversized Actuator Feed Accumulator Piston Kit 124740-40K

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.

6T70 (Gen. 1), 6T75 (Gen. 1) Oversized Actuator Feed Accumulator Piston Kit Vacuum Test Locations