4L80E, 4L85E Reverse Servo Piston 1997-up Billet

Description

4L80E - 4L85E Transmission Reverse Servo Piston
Heavy Duty Billet Aluminum
fits 1997-Up Style assemblies with "hump in piston"
Overall, the 4L80E is a fairly heavy-duty transmission.
One of its lesser points is the cast 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.
Our solution is this burly billet aluminum version. A direct replacement, it’s much stronger than the OEM casting by nature. Our engineers have made an effective leap forward in design to ensure your customers’ demanded durability.
The factory unit is weak where it needs to be strong: the area around the apply pin. We’ve engineered ours 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.
Our support bolts into place from two directions to hold firm: Through the servo apply pin hole and the hole originally retaining the band anchor plug.
4L80E Billet Reverse Servo When failure is not an option demand
34912AC
Notice the weakness of the red-circled pin area on the cracked OEM piston compared to the brute strength of our non-porous billet solution.
One of its lesser points is the cast 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.
Our solution is this burly billet aluminum version.
A direct replacement, it’s much stronger than the OEM casting by nature. Our engineers have made an effective leap forward in design to ensure your customers’ demanded durability.
The factory unit is weak where it needs to be strong: the area around the apply pin.
We’ve engineered ours 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. You have to put your name on the line and guarantee your work; consider using one of these in the next rebuild that can’t fail!
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