Valve body and internal components calibrated for elevated line pressure improve shift feel and transmission durability
Laminated triple separator plate enables dual feed for 3rd gear clutch, tripling torque capacity and reducing clutch wear
Highly improved wide land design boost valve and bushing resist wear for consistent pressure regulation
EPC boost pressure relief valve system protects against runaway boost pressure and case failure
Includes heavy-duty intermediate case snap ring, accumulator valve springs, and all necessary gaskets for installation
Summarized by Shop
This 4L80E Diesel Performance Reprogramming Kit fits all Hummer H1 and HMMWV vehicles equipped with 4L80E and 4L85E automatic transmissions. Common complaints on these transmissions are no upshifts, soft 2-3 shifts, burnt direct frictions, broken hard parts as well as gear ratio and solenoid performance codes.
The boost valve assembly is