The other slight problem you will run into is a 6" lift, which seem to be particularly scarce on the 2500 with the AutoTragic, um, I mean AutoTrac 4x4, if you still want the 4x4 to work. I used to have a '99 Suburban 2500 4x4 with the big block 454 (since upgraded to a diesel Excursion), and the...