RE THE PINTO........I'm sorry to have to tell you it's the hardest scenario.......without experience, you run the risk of Clutch and or Transmission Damage if you don't remove Tranny first and try the following while Eng is fully connected to Tranny......Sump off and loosen ALL Mains Caps by at least one thread. Remove Rear Main Cap completely and try pushing the top half "seal" around till it pokes out other side. Try pulling with Pliers to extract top half seal (Mechanic use a device called "Sneaky Pete" which is like wire that goes around till it shows at other end, grabs the half seal and pulls it out.
It's not enough to put in a new Seal...........strict Installation procedures must be followed or new seal will leak just as bad as the old one in no time.
I thank Lady Luck that EnFo enlisted Euro Engineers to design my Essex V6 which had a sensible full one piece modern Oil Seal that all modern cars have today, as this poor design in the Pinto would drive me nuts. I've put up with this in early Holdens and Fords for long enough.
What drugs were they on back in those "old days" when they invented the full one piece seal for the front, but decided to hell with the rear ???????