What brand seal did you use?

Was it leaking before you changed which car it was in ?

Did you have to modify the driveshaft ?

Did you examine the surface upon which the seal is in contact ?

Did you replace the seal as you did the transfer or did it leak and you have taken the driveshaft out once and replaced the seal ?

Is the seal leaking at the driveshaft surface or around the outside where it fits to the trans case ?