• Solenoid performance codes
  • Wrong gear starts
  • Clutch failure


Excess bore wear at AFL (actuator feed limit) bore allows pressure loss that causes driveability concerns.


Recover hydraulic control and renew shift operation by reconditioning the bore and installing Sonnax oversized AFL valve kit.

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

Oversized AFL Valve Kit
Part No. 124740-48K

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

In second generation GM 6T70/75/80 units, AFL valve bore wear results in low pressure at the shift and control solenoid valve assembly. The OE valve has a large reaction area and is highly affected by side loading, which wears the valve body bore. As the bore wear increases, oil pressure is reduced to the shift solenoids, which causes solenoid and ratio codes. This also results in lower line pressure.

Reconditioning the bore and Installing Sonnax oversized AFL valve kit 124740-48K will restore hydraulic control to the shift solenoids.

  • Hardcoat anodized aluminum valve combats premature wear
  • Oversized valve engineered to perform to OE specification
  • Valve
  • Spring
  • 124740 48k combo
  • 124740 48k

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.

  • 124740 48k test