Adapt-A-Case 4L80E HD Billet Low Reverse Servo Piston 4L85E 1997-up Automatic Transmission 34912AC
OPT Product Code: ADC-34912
Product Details
Adapt-A-Case billet low reverse servo
Models: 4L80E, 4L85E
Year range: All
Makes: Chevrolet, GMC, Hummer, Isuzu, Jaguar, Mitsubishi, Rolls Royce
The 4L80E is a fairly heavy-duty transmission. One of its weaker points is the cast aluminum reverse servo piston. This weak link is prone to breakage while enduring the repetitive cycling that occurs in applications such as, plow truck or towing. When the boost valve has worn or when the pressure spikes you are at risk of breaking the stock cast piston.
The Adapt-A-Case solution is this extremely strong billet aluminum version.
The OEM piston is thin around the apply pin. Adapt-A-Case engineered this unit far thicker than the original to combat the stresses of any side loading.
This unit is also thicker above the sealing ring groove which helps to stabilize the piston in the bore.
This transmission is known by the flowing part numbers and names: 4L80E, 4L80-E, MT1, 4L85E, 4L85-E, MN8
