MiniSimp: what year is your truck. I had an 83 shortbed that I swapped the rears up front. And ran Chevies in the rear with 33" AT tires. Weighed it at the truck scale down the road. And it was exactly 3,080 lbs. 100 lbs. lighter than my bro's CJUNK5 that's cut up and caged.
EDIT: That could've been the scale I used also. It's old, and open for public use. I guess so that the farmers can weigh themselves when thier loaded down with corn and grain.