+1You would be well advised to get an aftermarket posi. You will be doing the whole thing over again in the near future if you use a stock posi. If you are swapping gears, go to at least a 3.23 if you can find them. Anything less, and you are just wasting your hard earned dollars.
I am going to do the swap myself. Although I have never done gears it does not appear to be a difficult job.If you are going to pay for the labor of a gear swap, don't install the factory unit. Check around for a deal on a gear and diff package from one of the sites vendors, in the parts for sale section or even eBay.