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As for identifying parts on the truck, that shouldn't be TOO hard. First of all, what is it, 1500, 2500, 3500, etc? The 1500s for the most part come with 4L60-Es for transmissions (if it's 92-current, 91 and earlier has a TH700R4 or other TH transmission.). To idnetify your rear-end, the easiest thing is to count the bolts. I'm fairly sure most 1500s have a semi-floating 10-bolt 8.5" rearend. To find out, count the bolts holding the drain pan on the back of the diff. You have 10-bolt, 12-bolt, and 14-bolt GM diffenetials, and you could possibly have a Dana rearend, which I'm not 100% sure on how to identify. For the front diff, it should be the same process. I am pretty sure they just use modified rear diffs for the front, so the center chunks are still the same, 10, 12, 14 bolt or a Dana axle. Hope this helps.

EDIT: This Page http://www.lmctruck.com/icatalog/csb/full.asp?page=12 should help idnetify your tranny and diffs. If you don't have a suburban, don't worry, the trannies and diffs used are the same across all GM trucks...
Try looking on www.gmpartsclub.com
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