The 8 1/4 thread

My carrier is from 1973 that came out of a Duster. I am going threw all kinds of problems trying to get a sure grip to set up, I guess the gears I took off the peg leg and put on the sure grip carrier can't be dun, I wish I knew all about this before I bought it and put new bearings on it.. know I need a set of new bolts for the ring gear so I can put the peg leg (open Carrier) back in
Can anyone straiten me out on this ? I have 2.71 gears that came out of the 8 1/4.

My Rear end and sure grip carrier pictures

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