Forum Discussion

Bellavance's avatar
Bellavance
Explorer
Sep 17, 2020

FORD F-150 AXLE RATIO CHOICE

My new trailer (Keystone 26RBS) weighs only 6600 lbs + cargo.
I’m about to order a 2021 Ford F-150 equipped as follows:
V6 3.5 engine
Standard (not Max) Trailer Towing Package.
This truck has a 10-speed auto transmission, and can tow 10,500 lbs and the same 16,200 lbs GCWR with EITHER the 3.31 or 3.55 AXLE RATIO, according to Ford.
I was thinking about ordering the 3.31 axle ratio for fuel economy on flat highways, and pulling the trailer in 9th or 8th gear if necessary, which would raise the axle ratio as needed.
Can anyone help with this decision?
Thanks.
Pierre

59 Replies

  • max tow and 3.55. pay attention to payload you will need it to be around 2000 lbs. trailer that large id be going 3/4 ton.
  • prichardson wrote:
    I do not know what the difference is between Ford's standard and max tow package; but my choice would be max tow with 3:55, especially with that engine.


    Agree...Max tow with 3.55.

    Jerry
  • https://www.rvusa.com/rv-guide/2020-keystone-cougar-half-ton-travel-trailer-floorplan-26rbs-tr42323

    1st off you'll need the Max Trailer Package (53C comes with a 36 gal gas tank) you'll need that cause your mpg's will drop to the 9 mpg range, 2nd dry brochure tongue weight is 880 lbs. Add all the stuff that goes in front of the axles and you'll be pushing 1000 lbs or more for tongue weight.
    You'll need a high payload rating in the 1800-2000 lb range if you pack stuff in the truck and are taking passengers. The higher the payload rating the more stable the truck will be.

    Your TT will more than likely be around 7600 lbs loaded and at 30' long it will be a load for you 1/2 ton truck.

    I would opt for the 3.55 at a minimum and if I could I'd go 3.73.

    Not to go weight police but IMO a 3/4 ton gas would be much easier.
    won't get the empty mpg's but the tow experience will be much more relaxed.
  • If you are going to tow over 8,000 pounds get the 3:55.
    The 3:73 would be even better.
    You are asking a lot from a small engine and a trailer that weighs a lot more than your truck.
    I would suggest an F-250 or 350 for that weight and up.
  • Eight thousand pounds plus......3.55. Not towing...let the transmission shift down for fuel economy.
  • prichardson wrote:
    I do not know what the difference is between Ford's standard and max tow package; but my choice would be max tow with 3:55, especially with that engine.

    I had a F150 with the standard tow package - get the max tow package.
  • I do not know what the difference is between Ford's standard and max tow package; but my choice would be max tow with 3:55, especially with that engine.
  • Ivylog's avatar
    Ivylog
    Explorer III
    What % of the time will you pull...5%??? Get the 3.31 and pull in 8th if necessary. The days of a 3 speed and 4.11 are long gone.
  • Only 6600 pounds dry will be 7200-8000 pounds loaded. Combine that with pulling two sheets of plywood through the air at 65-70mph.

    That is a 7% difference in gearing. You'll never notice a measurable difference in fuel consumption. You will feel a 7% difference in wheel torque. I recommend 3.55 (or whatever the highest numerical axle availible).