Product Description
Fits: Toyota / Lexus U140 / U240 / U241 · 1998-on
TransGo pressure regulator and clutch apply boost valve kit (U140-BOOST) for 1998 and newer Toyota and Lexus vehicles with U140E/F, U240 and U241 transmissions. Drop-in USA-made hardened steel boost valves and bushings replace the soft aluminum OEM parts that are prone to wear.
Specifications
| Fits | U140, U240, U241 |
|---|---|
| Years | 1998-on |
Why it fails
High mileage units often have a worn B1 switch boost valve and bushing and a worn main line pressure boost valve and bushing. The ECM sets line pressure from calculated load by controlling current to the SLT solenoid. Adequate line pressure is needed for clamping force under all load conditions, to prevent slipping and to achieve proper shift quality.
A worn EPC boost valve and bushing causes slow or lazy pressure boost, flare shifts, burnt frictions and a burnt lockup clutch, often with gear ratio, shift and solenoid performance codes. Line pressure also acts on the B1 switch boost valve; when it sticks, B1 apply and release is impaired, causing no 2nd gear or 2nd gear starts.
Corrects, prevents or reduces: insufficient line rise; soft, slipping or flaring shifts; codes P0750, P0753, P0758, P0765, P0770 and P1760. Using SK U140 with this kit helps prevent the common problems in these high mileage 4-SPD FWD transmissions.
What's included
- USA-made hardened steel main line boost valve and bushing
- Gold shim (for some applications)
- USA-made hardened steel B1 switch boost valve and bushing
Notes
Adequate main line pressure is required to provide enough clamping force under all load conditions to prevent slipping as well as to achieve proper shift quality.
