A few years ago I was rebuilding an old flathead Ford on a woodie. I made the mistake of asking what oil to put in the engine on a Ford forum--and the fight was on! Everybody had an opinion and kinda like the Republican debates-- the other guy was either stupid, misinformed or a liar! I was sorry I asked.

Anyway I figure this bunch is waaaay easier to deal with, so I ask the question here without worry. What modern day lubricant are you guys using in your trannie (manual w/od) and the rear axle? I would assume they are all better than the old original stuff, but don't want to do anything that would cause harm.

Thanks, Keith