Valve, Pressure Regulator, Oversized, 4L60-E, 4L65-E, 4L70-E, GM (82-93)

A worn OE pressure regulator valve can be detected in two ways. The first is a dynamometer test that reveals low line pressure during boost conditions (look for 50-100 psi less than specified in Reverse). The second is vehicle symptoms such as clutch slippage, reverse chatter and 3-4 clutch failure. Any of the above problems indicate bore wear that should be addressed.

Refurbish the pump cover by reaming the bore and installing an oversized pressure regulator valve

The pressure regulator valve helps restore control over the pressure regulating circuit by eliminating leakage

You will need Tool Kit TAT-77917-TLCSX