Product Description
Tooling Required
U660E U660F U760E U760F Oversized B2 Apply Control Valve Kit
Toyota/Lexus U660E/F and U760E/F transmissions may exhibit delayed/slipping Reverse or no Reverse operation at all due to wear in the B2 apply control bore. The B2 apply control valve train regulates reverse clutch apply and release. If reverse slippage is not corrected in time, burnt B2 clutches can result. Sonnax oversized B2 apply control valve kit 47740-27K restores the necessary hydraulic clearances required for proper valve function, eliminating reverse apply issues.
- Hardcoat anodized aluminum valves combat premature wear
- Future side-load wear is decreased by addition of annular grooves, which help center valves in bore
- Proper reverse operation depends on a correctly functioning B2 accumulator; if problems are found with B2 accumulator piston or bore, Sonnax offers B2 accumulator piston kit 47740-11K
Symptoms
- B2 Clutches burned
- Delayed Reverse
- No Reverse
- Reverse slip
Cause
Oscillation of the steel B2 apply control valve train prematurely wears the cast-aluminum bore, allowing regulated reverse clutch apply pressure to exhaust to the sump or cross leak to adjacent circuits.
Correction
Restore proper hydraulic control by reconditioning the bore and replacing the worn valve train with the Sonnax oversized B2 apply control valve kit.
Contents
- Spring
- End Plug
- Inboard Valve Three-Spool
- Outboard Valve Four-Spool
