Hi,

I want to do an oil change on my diff. I just ahve a few qestions.
It seems that there is no need to open up the diff to change the fluid. There is a fill and a drain plug, and that makes it quite easy, but I would liek to know if there is some sort of gasket in the diff. I change the diff oil in the locker in my chevy truck, but unfotunately it doesnt have a drain plug. In some ways this is a royal pain, because the gasket isa pain to remove, however, I can really clean inside, getting the sludge out and the metal filings off the magnet.
I am really concerned because I want to put Mobil1 into the diff, but are worried about a possible gasket. If there is no gasket, and no parts, such that it is welded, then how would one clean it, is there a magnet inside at all? If it is welded, I can use mobil1 no problem and thats that. If there is a gasket, I suppose I should use regular dino oil, unless gear oil, being 75w-90 or so is sufficiently thick and viscous that it shouldnt seep out or leak, or else change the gasket, which Id like info on, if that is the case.
Thanks very much,

JMH