I just installed a 3/4 ton running gear in my blazer (14 bolt FF rear & 10 bolt front) and a 454 , with a TH350 and a NP208 and new set of 38X15.5x16.5 Radial TSL's, which actually measure 37". I was wondering what gears to go with, 4:10, 4:56 or 4:88? The 14 bolt bolt has 3:73 already, should i just keep them or upgrade? My concern is at highway speeds like 60mph & 65mph my rpm will be way to high with no overdrive. Im trying to stay in the powerband at all speeds, which is 2200-2600 rpm I believe for a big block such as mine. I am going to be doing a lot of highway driving to get to places to go 4X4 so im concerned about the gas millage. Also since its a 454 should I even be worried about lower gears since I will ge the extra torque from the big 454. Should I keep it low in the power band to save on fuel?