Symptoms:

Vehicles with Toyota/Lexus U660E and U660F transmissions may exhibit 2nd and 6th Gear shift complaints and a burned B1 brake. These problems may be caused by continuous oscillation of the steel B1 apply boost valve within the cast aluminum boost sleeve, creating excessive wear and a path for line pressure to exhaust and the B1 apply control valve to stroke prematurely. Sonnax B1 apply boost valve kit 47740-19K has upgraded materials and minimal clearances to prevent wear and restore proper hydraulic control. • Boost sleeve is manufactured from highly wear-resistant billet aluminum to prevent excessive wear • Restores proper line rise • Drop-in Zip Valve™ parts install quickly and easily Symptoms: • 2nd & 6th Gear shift concerns • B1 Clutches burned Cause: Wear at the B1 apply boost valve and sleeve can allow the B1 apply control valve to stroke prematurely, resulting in 2nd and 6th Gear shift complaints and a burned B1 brake. Correction: This Sonnax drop-in B1 apply boost valve kit features upgraded materials and tighter clearances to prevent wear and restore proper hydraulic control. Contents: • Valve • Sleeve