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4.56's probably be alright . . my brother's f250 running 38.5's we put 5.13's in and with overdrive does great down the interstate . . 75-80 mph at like 2200-2500 rpm
i had 4.88 with 44's with no od and did good down the street but since ya got over drive ya can go with just about anything ya want
are you just planning on driving it around town? my suggestion would be 5.13s ... ps i have some parts for a chevy truck (14bolt 10.5"ring, Th700r4 trans (less than 1k miles) with transfer case polyurethane gas tank ... front bumper cab hood and front fenders along with a few other things)