GM TH-700 R4 / 4L60E / 4L65E Brand New 3-4 Bonded Piston 

    

This bonded piston will provide a better seal and prevent fluid loss resulting in a stronger apply of this clutch pack and less chance of slipping. 

This will also retro fit back to all 700R4 units.

If your transmission has the aluminum piston with 2 lip seals, this is a better performing upgrade for that part and is much easier to install without the need for extra lip seal installer tools.

These pistons are generally a high failure item