I have a 2000 3500 7.4L 4X4 and love it. Been trouble free for 32000 miles. But, alas, I am working on a deal for a 2003 Ext. Cab D/A SB 4X4. The 2003 model year rebates of $5000 and GM employee discount are too tempting.
My 3500 Classic body style has served me well, and I will miss it. Just a week or two ago I got 16 MPG on one leg of a trip. Truck has 4.10 rear end too!