November 08, 2023
Vehicles with listed Toyota transmissions may exhibit insufficient line rise in drive ranges, soft shifts and/or burnt C1 clutches. These problems may be caused by continuous oscillation of the C1 apply boost valve within the boost sleeve, creating excessive wear and a path for line pressure fluid to leak to exhaust. Sonnax C1 apply boost valve kit 168740-01K has upgraded materials and minimal clearances to prevent wear and restore proper hydraulic control.
November 08, 2023
Vacuum testing at the port(s) indicated fails to hold the recommended minimum in-Hg, or if wear is visually detected.