Symptoms:

  • Erratic line pressure
  • Poor shift quality
  • Burnt clutches
  • Low converter & lube flow
  • Overheating
  • TCC apply & release concerns

Cause:

Continuous oscillation of the pressure regulator valve results in excess bore wear, causing erratic line pressure and/or restricting converter feed oil.

Correction:

Recover hydraulic control and renew line pressure performance by reconditioning the bore and installing Sonnax oversized pressure regulator valve kit.

6T70 (Gen. 2), 6T75 (Gen. 2), 6T80 (Gen. 2)

Oversized Pressure Regulator Valve Kit
Part No. 124740-60K


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

Second generation GM 6T70, 6T75, and 6T80 transmissions may exhibit multiple line pressure and converter-related problems due to excess wear in the main pressure regulator bore. Wear at the balance spool end allows critical fluid loss, resulting in excess line pressure, harsh shifts and overheating due to reduced cooler/converter flow. Wear at the outboard spool robs converter feed pressure and lowers line pressure, resulting in soft shifts and burnt clutches.

Reconditioning the bore and installing Sonnax oversized pressure regulator valve kit 124740-60K will restore hydraulic integrity for proper line pressure control in all ranges.

  • Oversized pressure regulator valve and matched spring restore OE function
  • Extended valve land for better sealing
  • Hardcoat anodized aluminum valve combats premature wear
  • Valve
  • Spring
  • End Plug
  • 6T70 (Gen. 2), 6T75 (Gen. 2), 6T80 (Gen. 2) Oversized Pressure Regulator Valve Kit 124740-60K
  • 6T70 (Gen. 2), 6T75 (Gen. 2), 6T80 (Gen. 2) Oversized Pressure Regulator Valve Kit 124740-60K

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. 2), 6T75 (Gen. 2), 6T80 (Gen. 2) Oversized Pressure Regulator Valve Kit Vacuum Test Locations