Description
Allison 1000 / 2000 / 2400 Oversized F-Trim Valve Kit, Sonnax 37000-30K.
Fits ’00–’05 units only.
Tooling:
- F-37000-TL30
- VB-FIX
The F-trim valve in Allison® 1000/2000/2400 (’00–’05) units is controlled by a PWM solenoid that continuously oscillates the valve. When the valve and sleeve become worn from constant motion the TCC PCS pressure is allowed to cross leak, or escape to exhaust, inhibiting the valve from stroking against the spring and causing converter apply concerns, TCC surge, TCC slippage, code P0741 and overheating. When wear becomes severe it can cause the valve to stick, causing converter release problems as well as apply problems, dependent on where in the bore the valve sticks. Reconditioning the bore and installing Sonnax oversized F-trim valve kit 37000-30K replaces the entire valve train to restore F-trim valve function to normal operation.
- Hardcoat anodized valve combats premature wear
- Annular grooves on the valve help center it in the bore to reduce future side-load wear
- Valve
- Sleeve
- Spring
- O-Ring
Symptoms:
- Overheated transmission
- Code P0741
- RPM surge
- TCC apply & release concerns
Cause:
The F-trim valve loses hydraulic integrity and malfunctions due to wear on its valve spool/bore wall, sleeve ID, and OD.
Correction:
Restore proper hydraulic control by reconditioning the bore and replacing worn parts with the oversized Sonnax valve kit.
