For General Motors 4T80E Transaxles
Apply oil for the overdrive servo in General Motors 4T80E transaxle is routed through the hollow servo pin to the back of the piston. This setup requires the case to seal on the pin. When the pin bore wears, apply oil is vented into the case, thereby dropping apply pressure and burning the band.
The 4T80 kit contains all tooling necessary to repair the Overdrive servo pin bore and is a RED series kit. It is available as a Master or Sub kit.