Originally Posted by ukrkoz
1. you broke the seal reinstalling driveaxle
2. you did not seat seal in right
3. all of the above.
unlikely, but you may have mismatched seal and driveaxle input shaft.
PS. you did not put driveaxle back in all the way. Happens. been there.
My vote is "PS." OP, the axle needs a bit of force to seat it into the transmission. Make sure the splines are lined up, the with some force it will pop in. There is a metal ring around the end of the shaft about an inch in. That ring needs to compress and then the shaft will slide into place. It takes a bit of force to get it to go.