Heavy duty 2-3 shift valve 77754-41 for 4L60-E, 4L65-E, and 4L70-E units will apply the overrun clutch in D3 1st, 2nd, and 3rd Gears.
Applying the overrun clutch in 1st and 2nd provides added durability to the input sprag and forward clutch in heavy duty vehicles, plow trucks and high performance applications.
The trans shift valve does not require tuning, it can be replaced directly. No special tools required. Extends life of the forward clutch and input spragIdeal for electrically downshifted units with aftermarket paddle shifters.
This upgrade works well with applications using aftermarket electronic paddle shifters. With the overrun clutch on, the Sonnax valve allows full downshift engine braking in 2nd, while the shifter remains in the D3 position.
Type: Valve Body Component; Items Included: 2-3 Shift Valve; OE/OEM Part Number: 77754-4; Material: Aluminum.