From what I remember about your year truck, a T-5 swap would entail shortening the drive shaft and you would be ready to go. I think the T-5 bolts to your bellhousing (you might need an adapter) and your master cylinder and emergency brake is not attached to the transmission as it is in the older Chevs and GMC's, so you should be able to bolt it in and reattach a shortened drive shaft. In light of all of that, I would go for it and if it doesn't perform like you want it to, get a 3.76 1st gear / .72 OD and swap. It wouldn't take any time at all to swap the two and you would probably be able to sell the lower geared T-5 with no problems.
