I just ordered a 4" skyjacker lift kit. My fenders are cut and there are ~ 2" ext. shackles in the rear. I am now looking at tires. I am debating between 33 or 35 x 12.5" in goodyear mt/r or bfg m/t's. I've read that the 35s will fit, but will they rub? My other concern is the power needed to move those 35's. My rig is a stock '76, 6 cyl and 4spd. Are they too much for the stock six?