Product Description
Fits: TH400, 4L80E, AT540, AT542, AT543, AT1545, TH350, TH250, TH425
A replacement outer lip seal for the forward and direct clutch piston in GM's TH400 and 4L80E automatic transmissions, manufacturer number 3643L, made in the USA. It is sold individually as a single outer lip seal for that clutch piston.