2006 and later General Motors and BMW vehicles equipped with 6L45, 6L50, 6L80 and 6L90 automatic transmissions often wear out the line pressure boost valve and sleeve. As a result, the transmission will not have the required main line pressure boost under load.
The computer tailors the line pressure rise in accordance with the calculated load. It does this by varying the pressure control solenoid current, which in turn varies the EPC solenoid pressure output. The pressure control solenoid output then acts on the boost valve, which in turn acts on the pressure regulator valve to raise the main line pressure accordingly.
Adequate main line pressure rise is required to provide enough clamping force under all load conditions to prevent slipping, as well as to achieve proper shift quality. Consequently, a compromised boost valve will cause complaints of soft shifts, flare shifts, burnt frictions and burnt lock-up clutch can occur. These can also be accompanied by a wide variety of gear ratio, shift and solenoid performance codes.
Features and benefits:
The TransGo drop-in OE ratio replacement boost valve and bushing assembly provides an economical and durable direct replacement for the OEM assembly that is prone to wear. This kit restores hydraulic integrity, as a result line pressure boost will once again meet the OE specifications. Our drop in valve requires no reaming or tooling.
- Insufficient line rise
- Soft, slipping or flaring shifts
- Burned friction material
- Codes P0729, P0731, P0732, P0733, P0734, P0735, P0736, P0961, P0965, P0969 and P0741
- TCC slip
- Precision USA-made hardened steel OEM replacement valve
- Precision made 6160 aluminum bushing
- Retaining pin