is your truck a fleetside or stepside? If you have a 10inch wheel on a fleetside you would want to go with 7inch back spacing. i always try to go with 3 inchs of face on the wheel. Depends on what wheels you get to some wheels only offer a certian backspacing to. So you might not get what you need. I know centerline dosent offer that many choices. When i went to purchase my budniks i had a hell of a time trying to figure it out because i got a soft lip wheel and they only come in a 20 by 8.5. I tryied calling budnik and they wouldnt give me any idea on backspacing because they said that the place i buy them from shoulud tell me and they cant let that info out. I called intro, colorado custom, and billet specialties they all told me the same thing. Im not really to sure about backspacing in the rear if you have a step side but if you go with a 8inch wheel in the front atleast go with 5 inchs of backspacing. just try to keep 3 inchs of face and you should be fine
old set up: 2002 chevy 5.3, procharger 12lbs boost, asm headers, ls1 edit, flames, 20inch budniks
New Set up: 2004 chevy 5.3 ext cab, 12 inch twisted suspension lift, 36's, exhaust.
future mods: 150-200 shot, ls1 edit, air intake, stall, 5.13 gears, 12s or bust