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High Performance Rear Ends
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What gear is in it now? If you have a 2.14 to 3.08 gear then you have a 2 series differential. If you have a 3.23 to 4.56 then you have a 3 series differential. If you have a 2 series you can get a thick 3.73 gear that will work on the 2 series without a spacer. I do not recommend using a spacer, especially in the 7.5 rear end.

Look at post number 8 in this thread. http://www.hotrodders.com/forum/10-bolt-gm-rear-end-rebuild-180154.html#post1282831
 
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