Tool Required

Printpartsummary
Symptoms:
  • Flare shifts
  • Harsh shifts
  • Low clutch oil pressure
  • No 4th
  • No 5th
  • No 6th
Cause:

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

Correction:

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

Tool Required

6T40 (Gen. 1), 6T40 (Gen. 2), 6T45 (Gen.1), 6T45 (Gen. 2), 6T50 (Gen. 1), 6T50 (Gen. 2)

Oversized Actuator Feed Limit Valve

Part No.

144740-01

Oversized Actuator Feed Limit Valve
  • 144740-01-in_combogen1

  • 144740-01-in_combogen2

  • Oversized Actuator Feed Limit Valve

Small_144740-01-in_combogen1 Small_144740-01-in_combogen2 Small_144740-01

6T40 (Gen. 1), 6T40 (Gen. 2), 6T45 (Gen.1), 6T45 (Gen. 2), 6T50 (Gen. 1), 6T50 (Gen. 2)

Oversized Actuator Feed Limit Valve

Part No. 144740-01

Complaint:

  • Flare shifts
  • Harsh shifts
  • Low clutch oil pressure
  • No 4th
  • No 5th
  • No 6th

Cause:

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


Correction:

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

The function of the actuator feed limit (AFL) valve is to provide regulated pressure to shift solenoids. Wear in the AFL bore causes low clutch pressure and results in transmission slips/harsh shifts. This eventually leads to a loss of 4th through 6th gears, and finally the loss of transmission function. Reconditioning the bore and installing Sonnax oversized AFL valve 144740-01 restores hydraulic control for revived shift operation in all ranges for GM Gen. 1 6T40, 6T45, 6T50 and GM Gen. 2 6T40, 6T45, 6T50 units.

  • Hardcoat anodized aluminum valve combats premature wear
  • Annular grooves help center valve in bore to reduce future side-load wear

Required Tools

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.

  • Test Locations
  • Test Locations

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Valve Body Layouts

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.

Valve Body Layout GM 6T40 (Gen. 1), 6T45 (Gen.1), 6T50 (Gen.1)

Related Tech Articles

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