The pinion seal in the rear end of my '54 Mercury has been leaking so I decided to replace it. I marked the parts as outlined in the shop manual so I would reassemble it with the correct pre-load. I went to loosen the nut with a socket and a breaker bar, only to find that the nut was already loose to the point that I could remove it by hand! This is probably why it was leaking in the first place. I removed the parts including the seal and I am ready to re-install everything. The marks I made are obviously useless because the nut was not torqued to the right amount but was loose. How can I get the nut torqued correctly without taking the differential apart? I don't want to mess up the bearing or other parts by torquing the nut incorrectly. Thanks, Alan