GM 4L80E Upgraded Billet Reverse Servo (1997-UP) Adapt-A-Case

Product Description

4L80E Transmission HD Billet Reverse Servo 

Services 1997-UP Style Assemblies w/ Hump

Made in the USA by Adapt-A-Case

Overall, the 4L80E is a fairly heavy duty transmission.  One of its lesser points is the case aluminum reverse servo piston.  This weak link is prone to breakage while enduring the repetitive cycling that occurs in plow truck applications, when the boost valve has worn or when the pressure spikes.  Adapt-A-Case's solution is this burly billet aluminum version.  A direct replacement, it's much stronger than the OEM casting by nature.  Their engineers have made an effective leap forward in design to ensure your customers' demanding durability.

The factory 4L80E unit is weak where it needs to be strong in the area around the apply pin.  Adapt-A-Case engineered theirs far thicker than the original to combat the stresses of any side loading.  Another touch is the additional thickness above the sealing ring groove that helps to stabilize the piston in the bore.

Adapt-A-Case support bolts into place form two directions to hold firm.  Through the servo apply hole and the hold originally retaining the band anchor plug.