Forum Discussion

Grodyman's avatar
Grodyman
Explorer
Jan 31, 2017

Taking the Plunge (Gear Swap)

After owning a F250 6.2/3.73 for 5 years and now owning another (dually) 6.2/3.73 truck I have decided to take the plunge and swap gears to 4.30.

With the F250 I have towed a 11750 GVWR 5th wheel, a Rockwood Mini Lite 2304S (5000lbs), and carried two Lance 830 truck campers.

I have driven with stock LT245/75R17 tires and 33" tall Vision 19.5's/LT245/70R19.5G tires.

Hopefully in a few weeks I will be able to provide real feedback pertaining to the differences between the two gear ratios, based on having experienced both.

Gman
Tow Vehicles
  • Grodyman's avatar
    Grodyman
    Explorer
    Jan 31, 2017
    06Fargo wrote:
    Grodyman- are you running the 33" tires on the truck to be swapped?


    No, I have a new 2016 F350 dually, but the tires are Lt245/70R17, diameter is about 31". I will never get taller tires for this truck. I was considering 4.56's but feel it may be too much gear for the stock tires. I still have my brand new Visions/Tires that I removed from the old truck.

    Gman
  • noteven's avatar
    noteven
    Explorer III
    Jan 31, 2017
    Grodyman- are you running the 33" tires on the truck to be swapped?
  • 2112's avatar
    2112
    Explorer II
    Jan 31, 2017
    I understand I'm talking about a different animal but I had a 1997 F150 with a 4.6/3.55. After towing a 6000lb TT for two years I replaced the 3.55 with a 3.73 and it made a world of difference. Acceleration and dealing with headwind was the most noticeable. It cost me $800 in 2000, money well spent.

    Going from a 3.73 to 4.30 on your F250 will be a good move. The change in grunt will be noticeable. You will enjoy the change
  • gbopp's avatar
    gbopp
    Explorer
    Jan 31, 2017
    Definitely keep us updated. It should be an excellent test. Same truck, engine, driver and load. The only difference is the gears.

    I'm curious how much of a difference it will make when towing. Let us know if there is much of a change in MPG.
  • Grodyman's avatar
    Grodyman
    Explorer
    Jan 31, 2017
    Bionic Man wrote:
    Just curious what is your main reason for changing the gears?


    The Ford 6.2 with 3.73's is a fine combo, but I just want more grunt.
    Gman

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