| yes you can fit a 33" tire under a 3/4Ton GM truck but depending what wheels you have will make a big difference how hard they rub or if they rub at all,like a 20" wheel if it is a 10" wide wheel with a 5"BP yes they will rub but if you drop that down to a 9" wide wheel with a 4.5"BP and run the same tire your chance of them rubbing has been cut in half.what i'm trying to say is don't go with too wide of a wheel and try to stay with a 4.5"BP versus a 5"BP for the most part..hope this helps
ps you'll have to crank the T/Bars up to clear 33" tires.
__________________ James 
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