Hey guys, first of all I'd like to start off by saying how valuable this site has been for me with my restoration. Thanks in advance!!

Anyways, my 68 RS/SS came with 2 differentials one of them was on the car and the other was just a spair. Neither of them are posi unfortunetely, but they are both 10 bolt rears. Now my question is to anyone who can help me identify both rear ends. My guess is one is an 8.2 and the other an 8.5. They do look different. The one that was on the car, looks as though it has deeper leaf spring brackets to compensate for the multi leaf I'm sure and the other has very shallow leaf spring brackets. Any help there would be great as-well. Can anyone help me identify with pics or some good liturature on how to tell the difference betweent the two, and what rear I should use with my 454 BBC, 500 H/P, 4 speed muncie.

Here are some pics of 10-bolt rears:

http://www.novaresource.org/axle.htm

Thanks all the help is always appreciated.

The 8.2 10 bolt has a 1 1/8 inch pinion nut and 3/8 ring gear bolts with 9/16 heads. The 8.5 10 bolt has a 1 1/4 pinion nut and 7/16 ring gear bolts with 3/4 heads and left hand threads.