A common problem in GM 200-4R and 4L60 transmissions is burned bands and/or 3-4 clutches. This failure can be reduced by eliminating throttle boost oil leakage.

Throttle valve boost valve and sleeve are made from made from hardened steel for better wear resistance

O-Rings on sleeve separate throttle pressure and Reverse boost circuits, providing additional protection against cross-leaks

O-Rings prevent loss of oil between the outside diameter of the throttle valve sleeve and pump body

Drop-in Zip Valve™ parts install quickly and easily