8.75, 741 pinion seal replacement.

Ditch the drums, install Green Bearing and run Disc brakes ( I will be after I finish my rebuild on my rearend). Also ditch the 741 and get a 742 or 489 (preferred) and use a solid instead of a crush and no more back lash problems. You can get the soild one for about 80 bucks (that what I paid for mine).