Oh Lordy, I now own a Fordy (a Lincoln actually)..

[big gear head]

That is the 9 3/8 rear end, not a 9 inch. If you ever have to get parts for it then this is what you need to ask for. The pinion housing is sealed with an O ring, not a gasket. Sometimes you can pull the pinion housing out without having to remove the whole chunk, but many times you have to remove the chunk and loosen up the backlash before the pinion housing will come out. When you remove the pinion housing there will be shims between it and the chunk. This is how the pinion depth is adjusted. Don't damage these shims. It's been several years since I built one of these, but I think the shims are larger than what a 9 inch uses, and I'd hate to have to find replacements.