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cliffy49's avatar
cliffy49
Explorer II
Apr 09, 2018

3:31 Gearing

Looking into the possibility of a new to me TV. I just looked at a 2012 F250 with a 6.7 and 3:31 gears.

What I would like to know is if anyone here tows with this set-up and how it works. I realize that 3:31s are not normally the ideal choice for towing but since this is a diesel, it may be different. I realize that 4:10s or 3:73s would be a better choice. Buying used you do not always have a choice of the perfect unit.

The truck appears to have towed since it does have what I guess are part of the mount for a fifth wheel hitch in the bed. Also it appears to have the tow package just not the best set of gears.

Not trying to start a feud as to what is best, just trying to get comments and advice on this set-up. Thanks in advance for all of the help.
  • Actually there is little choice and the gearing will be fine. 3.31 was used with 18" wheels and 3.55 was used with 20" wheels. The overall effect was the same with the engine turning the same RPM at the same speed. One exception is that the snow plow preparation package and the camper package had the 3.55 with 18" wheels. A diesel turns at a much lower RPM than a gas engine and you should not compare the gearing between the two. Now if you really want something to unnecessarily worry about, consider the fact that 5th gear is overdrive and 6th gear is over overdrive.