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Has anyone installed a posi unit themselves. I have a s-10 rearend and a posi unit and my budget is tight and I would like to do it myself if it is possible.

You will need a dial indicator to set the backlash and you may have to purchase a shim assortment to set the side clearances, but it's not that hard. If you are going to do any hard launches at all though, I would do away with the crush sleeve and do the spacer thing as the crush sleeve will do just that over time and you will have a loose pinion = expensive. All of this stuff can be found at a 4x4 shop of which there should be plenty of in 'bama. One tip, lot's of people shy awat from this as it looks like a lot of work, so keep any extra shims, charge appropriately, and as people find out you can do it, the extra work will roll in. Easy money...

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not to hijack the thread but what is the way to weld the gears to make a posi rear??? and what is this "lock up plug"???
http://www.howeracing.com/DriveTrain/Index-RearEnds-SpoolDiffs.htm