Protects the forward clutch inner lip seal from being damaged when installing the forward clutch piston onto the input housing. Transmission Type: 700-R4, 4L60, 4L60-E Features: Made in the USA. All steel construction. Won't crack or break like the cheap plastic ones. Prevents tearing of the lip seal by protecting it when installing. Similar to Atec Trans-Tool T-1528 & Kent-Moore J-29883 For use on these Transmissions GM - 700-R4 GM - 4L60 GM - 4L60E