you should be fine. i have a 97 c1500 on a 4/6 with 20x8.5 with a 5" backspacing and 255/35/20's and theres no rubbing at all. but i do have my fenders rolled just in case. you can check out some pics in this thread: http://www.gmfullsize.com/forum/showthread.php?t=5972
i got an 84 1500 ecsb with a belltech 4/6. and im runnin a 255/35/20, works great, and honestly, i couldnt go much bigger. however, u will need to either trim out or roll up the fender lip, especially on the passenger. bc of how gm built their trucks, the body is not perfectly centered on the frame. it is off center towards the drivers side. but, as far as everything else goes, you'll be fine. just dont go crazy with speed bumps and pot holes, you'll dent your rims faster than u can say boo.
Get some "tin snips" and cut the top part of the lip in a few places so that the lip will bend up. then with a piece of 2" steel square tubing that has a notch cut in the top of it insert the notch into the lip and push inward on the tube. It's pretty easy like this, but you could also use channel locks or pretty much anything that has a good grip to it.
thanks everyone for all of your help. :ninja: :driver:
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