I am replacing my 1998/99 D1 transmission this weekend. Wondering how hard it is to replace the rear main seal? It still has the factory gems 4.0, Can it be done with out pulling the oil pan? I haven't looked at the rave yet due to my work schedule. I have done this on many other vehicles and it was as simple as take out the old one and press in the new one, I am just wondering if rover has made it this simple or not.