Well, I figure it this way. My front springs were quite saggy, 5" of lift up front with an 1100 pound motor hanging up there, and my tires are probably half an inch shorter being on a wider wheel....I'd reckon that'd be about right, at least it seems that way. Who knows, I'll take some measurements of my truck, the shop door, and a picture just for fun.
I've figured up the weight before. I weighed it once with the 6.2 and 700R4 in it at the local scrapyard. With a full tank of fuel and me in the truck it was 5940 pounds (lifted + tires). I figured the motor added about 500, trans added somewhere around 200 pounds with the clutch, flywheel and all that, and the transfer case might have added 75 pounds or so then throw in a few pounds for miscellanious crap. I'd say somewhere between 6500 & 7000 pounds. I'm planning to haul off some stuff on Friday, I'll let you know how much it weighs.