I have had an aluminum case for my mopar 8-3/4 rear. I thought it was a 489 case but how do I know for sure. I bought richmond gears 3.55 and eaton detroit truetrac with new richmond bearing kit all for a 489. but it looks like the front pinion gear bearing is to small that came with the kit.
the aluminum center section has no numbers on it to go by.
if I have all 489 stuff I assume it wont fit a 742 case is that correct?

thanks