These complaints can be caused by wear of the reverse boost valve sleeve, allowing line pressure to escape to exhaust.
This Sonnax reverse boost valve kit has upgraded materials and tighter clearances to prevent wear and restore proper hydraulic control.
Vehicles with Toyota/Lexus U660E, U660F transmissions may exhibit insufficient line rise in reverse gear, delayed reverse engagement and/or a burned B2 brake. These problems may be caused by continuous oscillation of the steel boost valve within the cast aluminum boost sleeve, creating excessive wear and a path for line pressure to either leak to exhaust or leak to the EPC boost circuit and create high line pressure conditions.
Sonnax reverse boost valve kit 47740-17K has upgraded materials and minimal clearances to prevent wear and restore proper hydraulic control.
Sonnax valve body layouts provide a detailed overview of individual units making it quick and easy to determine what’s available for the specific valve body you’re working on. See all Sonnax valve body layouts.
December 09, 2013
Topics: Identification Guides Transmission Toyota/Lexus U760F Transmission U660F Transmission U760E Transmission U660E TransmissionRead Now
December 30, 2013
Topics: Vacuum Test Guides Vacuum Testing Transmission Toyota/Lexus U660F Transmission U660E TransmissionRead Now
September 30, 2005
Topics: Diagnostics And Theory TransmissionRead Now
Contact a Sonnax Parts Distributor.
A vacuum test at the port indicated fails to hold at least 18 in-Hg.