Symptoms:

  • Erratic line pressure
  • Maximum adapt
  • Code 1811
  • 2nd Gear starts
  • Poor EPC control
  • Long shifts
  • TCC piston failure

Cause:

Actuator feed limit bore wear results in unregulated pressure at the EPC solenoid, 1-2, 3-4 shift solenoid and the 1-2, 3-4 shift signal circuit.

Correction:

This wear-resistant sleeve and valve assembly allows the salvage of the case cover by re-establishing hydraulic integrity of the AFL circuit.

4T65-E

AFL Valve Kit
Part No. 84596-02K


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

The OE actuator feed limit (AFL) valve routes regulated line pressure to the pressure control solenoid and the 1-2, 3-4 shift signal circuit in GM 4T65-E units. Wear at the AFL valve bore can cause low torque signal and/or low 1-2, 3-4 shift solenoid and shift signal circuit pressure, resulting in Code 1811, maximum adapt or long shift, TCC slippage and wrong gear starts. Bore wear also can cause poor EPC control, leading to high line pressure and TCC piston damage. The Sonnax AFL valve and sleeve kit 84596-02K restores hydraulic integrity to the AFL circuit.

  • Highly wear-resistant aluminum sleeve provides more support and durability to prevent wear
  • Wear-resistant, hard-anodized valve maintains proper clearance with thermal expansion
  • Annular grooves center the valve to prevent wear
  • Regulating pressure is reduced by about 10 psi to prevent high line pressure, which can lead to TCC piston damage
  • Sleeve
  • Valve
  • Regulating Spring
  • Sleeve Retention Spring

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 4T65-E Valve Body Layout

GM 4T65-E Valve Body Layout
  • 4T65-E AFL Valve Kit 84596-02K
  • 4T65-E AFL Valve Kit 84596-02K

You need this if...

A vacuum test at AFL port fails to hold 18 in-Hg of vacuum or higher, or a wet air test (WAT) at the AFL port produces excessive leakage from the two locations indicated.

4T65-E AFL Valve Kit Vacuum Test Locations