OK folks. I stumped my local Ford sales person - not hard to do. Anyway I am looking at getting a 2020 F350 SRW probably after the first of the year. My current 2004 F350 dully king ranch withe 6.0 makes 325 HP and 560 Ft-Lbs of torque. I am running 4:10 LS gearing in the rear end, Trans is the 6 speed. It pulls my 220RK fine and my previous 12K trailer OK before. Could use a bit more power on steep grades for towing both. Fuel mileage - 16 solo and 10-12 towing.
Now the 2020 6.7 is producing 475 HP and 1050 FT-Lbs or torque and has the new 10 speed behind it, Gearing on the 10 speed seems to be secrete, except the top 3 gears are OD.
Rear end has to gears available. Either 3.31 or 3.55. Looking down the road I will probably stay on the smaller 5er side, but for this post assume 12K max on trailer.
So for mountain towing and keeping up with and for folks (not impeding traffic) do I go with the 3.31 or go with the 3.55 which is where I am leaning as it would put less tress on things and have better gearing for down grade control. Solo MPG is important, but I am not finding much information on the expected differences.
Hopefully there is an informed gear head that can enlighten this engineer.
Thanks
Keith
PS what is strange now a days is I cant find a towing guide that you input your trailer specifications and it tells you what gearing to get. Back in 04 Ford had that available at the dealers .- no more
Now the 2020 6.7 is producing 475 HP and 1050 FT-Lbs or torque and has the new 10 speed behind it, Gearing on the 10 speed seems to be secrete, except the top 3 gears are OD.
Rear end has to gears available. Either 3.31 or 3.55. Looking down the road I will probably stay on the smaller 5er side, but for this post assume 12K max on trailer.
So for mountain towing and keeping up with and for folks (not impeding traffic) do I go with the 3.31 or go with the 3.55 which is where I am leaning as it would put less tress on things and have better gearing for down grade control. Solo MPG is important, but I am not finding much information on the expected differences.
Hopefully there is an informed gear head that can enlighten this engineer.
Thanks
Keith
PS what is strange now a days is I cant find a towing guide that you input your trailer specifications and it tells you what gearing to get. Back in 04 Ford had that available at the dealers .- no more
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