Sonnax Heavy Duty 2-3 Shift Valve

Heavy Duty 2-3 Shift Valve
Part No. 77754-41

Find a Distributor

When the GM 4L60-E family of transmissions evolved from the 700-R4, the overrun clutch is no longer applied in 1st and 2nd when accelerating from a stop in D3 shifter position. This change was made to improve coastdown drivability in D3 but had the side effect of reducing the torque capacity of the input section.

For greatly improved input sprag and Forward clutch durability, Sonnax drop-in, 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.

Improves input sprag and Forward clutch durability
Critical upgrade for all heavy-duty and performance vehicles
Drop-in Zip Valve™ parts install quickly and easily

Range	Gear	Overrun with OE 2-3 Valve	Overrun with Sonnax 77754-41 Valve
OD	1st	OFF	OFF
	2nd	OFF	OFF
	3rd	OFF	OFF
	4th	OFF	OFF
D3	1st	OFF	APPLIED
	2nd	OFF	APPLIED
	3rd	APPLIED	APPLIED
D2	1st	APPLIED	APPLIED
D2	2nd	APPLIED	APPLIED
D1	1st	APPLIED	APPLIED
D1	2nd	APPLIED	APPLIED

Learn More About Zip Valve™ Drop-In Repairs

Note

Not compatible with 2005 Corvette with 1MX separator plate

Valve Body Layout

Sonnax valve body layouts provide a detailed overview of individual units making it quick and easy to determine what’s available for the specific valve body you’re working on. See all Sonnax valve body layouts.