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3.54 gears vs 3.73
hey everybody, i just bought a 97 f450 dually superduty powerstroke with a dana80 and 4r100 tranny.
Recently im finding that my truck is getting HORRIBLE gas milage since i sit at right about 2800 rpm's to cruise at 70 on the freeway. I dont tow much at all, this is mainly a work truck the most it may ever see is under 3000 pounds on the bed, and maybie 1000 on the hitch. Also im putting a flatbed on the back of the truck to try and get some good MPG out of it.
So my main question is, is 3.54 too tall of a gear that would actually reduce my MPG since i would have to lug the motor more to just pull around the truck? Or would 3.73's be better?
I could also put in 4.10's but i dont think ill ever need a towing capacity that 4.10's would offer, and i may get better gas milage without it. if i go with the 3.73's im going to get the thin gearset for my larger dana80 carrier.
Any input is appriciated.