Kevin G.

That seal had to have been put in wrong before, as they rarely leak, the TH400 Trans is one of the most bullet-proof transmissions ever made; they put them on GM motor homes back in the day; be sure they put in a new solenoid on the shifting module, as that is inside the transmission and 'messy to change later and the new style works a lot better than the old copper-colil one.

Type F ATF