- 1-2 Band burned
- 1-2 Flare
- Delayed engagement
- Low Reverse pressure
These complaints may be caused by the continuous reciprocation of the 1-2 (forward) and reverse servo boost valves wearing the valve body bores.
This oversized, hard-coat anodized aluminum valve restores hydraulic integrity, and has increased valve-to-bore contact to prevent leakage. This valve requires the use of a Sonnax reaming tool kit.
Oversized 1-2 & Reverse Servo Boost Valve Kit
- Long Spring
- Short Spring
- Coiled Spring Pin
Fits either of 2 locations
The continuous stroking of the 1-2 (forward) and reverse servo boost valves wear away at the valve bore, creating excess clearance and reduced apply pressures. This can lead to 1-2 band slippage, delayed engagements, 1-2 shift flares, and decreased reverse pressure. Sonnax has developed an oversized valve 84754-40K that will restore the hydraulic integrity and more than doubles the valve-to-bore contact area to prevent leakage.
- Valve is manufactured from hard-coat anodized aluminum to prevent future bore wear.
- Valve will fit both the forward and reverse applications for the 4T60, 4T60-E and 4T65-E
This kit only contains one valve. If both bores need to be repaired, two kits are required.