hey guys, im doing a gear change in the rearend, i need to know what pinion bearing size to use. i have the 489 casting.
car is a 71' c-body.

mancini racing never got back to me, and i was wondering if anyone knew the specs. (length, radius, bore?)

NATIONAL Part # M88048 Taper Bearing Cone; Bore=1.3125", Length=0.875", Radius=0.031"
Rear Axle; Outer; Chrysler 8.75" R.G.; Casting No. 741
Rear Axle; Outer; Chrysler 8.75" R.G.; Casting No. 489

sound right to anyone??

 

There should be a number on the old bearing. Any bearing supplier can cross

 

489 casting 1 7/8" pinion: front: cup,M88048..cone,M88010 rear:cup,M804049..cone,M804010.

But,why just the pinion bearings? You would be better off getting a full bearing kit from Mancini.
http://chucker54.stores.yahoo.net/reaxcobeshki.html

john