I could be wrong but I think I remember reading that the frame horns need to be adjusted to correct the gap, going from 1/2 to 3/4 ton caps you may not have to but keep searching as I'm sure this has been done somewhere on the internet.
Edit: I'm assuming you know that you will also need new front fenders because you didn't list it in the original post.
03-06 1500 & 2500hds are the same sans the top bumper cap. You'd need everything door/windshield forward and you'd need 03-06 frame horns because they're different from your 99-02. Other than the frame horns is bolt on I think.
I'm thinking about getting a custom bumper made. Other than the bumper, all HD parts will fit? I don't want to pay up the ass for the wrong parts... the shipping is a killer!
A forum community dedicated to GMC and Chevy full size owners and enthusiasts. Come join the discussion about Silverados, Sierras, and other full size trucks performance, modifications, suspension, lift kits, tires, maintenance, and more!