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Your cart is empty. Heavy Duty 2-3 Shift Valve4L60-E Sonnax has developed a drop-in replacement 2-3 shift valve that applies the overrun clutch in D3, 1st, 2nd and 3rd gears where the factory valve applies the overrun clutch only in D3, 3rd gear.
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.
In addition, 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.
No special tools requiredExtends life of the forward clutch and input spragIdeal for electrically downshifted units with aftermarket paddle shifters
Jimmy
Reviewed in the United States on July 29, 2022
Sweet valve, when you're in D3 this valve makes your overrun clutches come on in 2nd and 3rd gear also. I wasn't crazy about drilling a small hole in my valvebody, but they are plentiful if you mess it up or if you ever want to go back to stock. Kind of causes a harsh 2nd to 3rd downshift while coming to a stop, but while you are in D4 can't tell any difference. Look on the internet if you're not sure where to drill, took me picture after picture before I finally decided where to drill.
Darrin S.
Reviewed in the United States on December 24, 2021
You can't go wrong with the R&D that Sonnax puts into all their products!
josh hampton
Reviewed in the United States on August 5, 2020
Used during 4l60e rebuild along with complete Sonnax Servo and performance pack. It may seem pricey to purchase all but it seems to have hell of a lot of holding power. Converter lockup now is unreal. No flair during shifts. Down shifts are nice and noticeable along with this item installed. Makes it nice Slowing down while towing.Shifts are firm and noticeable from 1-2 but the rest are quick with no flair or lag. Iām very pleased with complete package.Items were Installed on 1/2 ton 4x4 suburban.
Just Sayin
Reviewed in the United States on June 28, 2019
Great selection of upgrade parts to strengthen and correct known 4L 65e transmissions
David
Reviewed in the United States on May 3, 2019
Great product as always
TDPT
Reviewed in the United States on July 7, 2018
perfect
Shan
Reviewed in the United States on June 26, 2017
This really helped the 2-3 shift flare in the 4L60e. I would buy again and I always recommend these to friends now with tired transmissions.
Seabee21
Reviewed in the United States on June 17, 2016
works amazing and shifts awesome!
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