I'm just throwing all this out there. I've done alot of thought on the same thing-
There a ****ing monster kenny bell blower setup on craigslist right now. Its still installed on an H2 right now, so you can hear/feel it run.
As much as our trucks weight, and full time 4wd. Its gonna grenade that stock tranny quick. If you had 2 wheel drive and could just obliterate the rear tires in smoke...You would get some life out of it. But an H2 is 100% gonna hook.
I wouldn't even **** around rebuilding the stock tranny. I'd go straight for a real truck tranny- 4l80. Kits are all out there to do it, nothing to rig up yourself.
I honestly think if your mechanically inclined, you can throw a diesel in it cheaper. 5G for blower, plus tuning. 2-5G for a tranny that can hold. The pistons in our motors arn't the greatest for forced induction. Forged lowerend 5-8G. Yea, blower is less initial expence, but when you start breaking ****, gonna start adding up pretty quick.
My blower is still sitting in my garage, not installed for this exact reason. I'm gonna go w/ an 07 diesel and allison tranny (6-8G depending on mileage, plus what ever you can get out of your stock engine, tranny, drivetrain) when I catch up on my other projects (1200HP twin turbo, forged stroker- 01 ram air trans am).
You think your gas mileage sucks now...
http://lasvegas.craigslist.org/pts/2574482630.html