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Originally Posted by Windturbineguy
I went through the same question last week at the dealership. I went with the 3.55's, only because Last year I bought a 6.7 cummins with 3.42 gears and when towing my 5th wheel, about 16k, the mileage was horrible. I didnt expect it to be such a difference and tried to go for better fuel economy, which it had when not loaded. I pulled the same trailer with my company cummins, 6.7 with I want to say 3.73's and it was about 3mpg more economical. I pick up my 2011 f-350 tuesday, and friday I am pulling the trailer from waco tx to portland oregon. I will let you know how it goes.
Please do let us know how you come out on your mileage pulling the 5er.
01 LWB CC SRW 4x4 7.3 auto
Stage II's,HPX, In tank and pre-pump mods,regulated return
AFE stage II,Garrett BB Turbo,4" turbo back, ITP overboost annihilator, 10 pos. DP Tuner,
Motor and tranny rebuilt. forged rods,Mahle pistons, all balanced, new valves,Comp 910's,C/M P-rods,ARP Studs , homemade AIH delete kit, twin TRU-Cool tranny coolers,Ride-Rite air bags B-D X-Monitor
Don't worry about the Mule, just load the wagon.