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gear ratio 3:73 or 4:10 ....................

Discussion in 'Trucks and Trailers' started by i_plant_art, Dec 5, 2004.

  1. i_plant_art

    i_plant_art LawnSite Senior Member
    Messages: 558

    im thinking of changing my gear ratio in my truck i think it would help me to pull loads alot better i am curious to know what all of you think would be the best ratio to have based on towing and hauling 3:73, 4:10 or something different.
  2. PLM-1

    PLM-1 LawnSite Bronze Member
    Messages: 1,640

    it sorta depends on the engine and transmission. 4:10 for smaller engines and 3:73 for larger engines. It also depends on what you are towing. Heavier weight would call for different rear ends.
  3. Eric 1

    Eric 1 LawnSite Bronze Member
    Messages: 1,220

    What kind of truck is it, what engine and trans, is it 4x4?
  4. dishboy

    dishboy LawnSite Fanatic
    from zone 6
    Messages: 6,109

    Also tire height plays big here.

    UNISCAPER LawnSite Bronze Member
    Messages: 1,426

    As a general rule here...Our diesels are running 3:73 posi. When we had gas, a K-2500 with a 350, or a 454 had a 4:10. Even with a big block, it bogged pretty low by the time we hit the summit of any grade. I was a little leary about new trucks with 3:73, but, they got lots of torque, can actually accelerate up a grade pulling a load.
  6. i_plant_art

    i_plant_art LawnSite Senior Member
    Messages: 558

    its a f350 4x4 7.3 powerstroke..... right now i dont know what gears it has i have not gotten under then truck to read the tag due to all the wet weather we have been having.
  7. MP350

    MP350 LawnSite Member
    Messages: 185

    94 to 97 came with 3.55 or 4.10 gears, You can look on the edge of the drivers door and get the rear gear code. But if your rpm's are around 2000 at 70 mph you have 3.55, around 2500 you have 4.10.
  8. blublazes

    blublazes LawnSite Member
    Messages: 63

    is it a dually? or a single wheel ton? I have a 2001 F-250 with a 3.73 and it works well for anything I pull. Cant imagine needing the 4.10 with as much torque as these engines have.


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