You can do it yourself....not really that bad. I had never been inside a t-case but took it on myself and had no issues.
Depending on the flange you get, the kit ranges from $340-$425. I installed the $425 with the 1350 output flange.
http://www.jbconversions.com/product...1c_std_sye.php
All you do if follow the instructions that JB put's out. Pretty good with pictures and everything!
http://www.jbconversions.com/pdf/16-1205.pdf
Once all installed, all I did was call Tom Woods with measurement and he fabbed up a custom driveshaft. Another option is to go to your local shop and have them build it for you. In retrospect, this might be the easier thing because your local shop will own any problems if they arise. Worth checking on since you already have a driveshaft. Might make it cheaper if you can re-use some parts.
Now saying all this, first try everything without it and see if it's bad enough.
Any shims for the axle, get steel ones that bolt to spring pack. Those are the safer ones. I do not like the aluminum ones that just slide in.
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- Jeff
89' K5 Blazer, 2.5" lift, 35" tires
04' GMC Yukon XL, 3/4 ton, 8.1L