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3.73 vs 4.10 Gears

Discussion in 'Towing & Trailer Tech' started by Six point, May 11, 2014.

  1. Six point

    Six point Member

    My 6 liter,3.73 geared, 2500 HD towing a 7500 lb travel trailer struggles on some of the hills around here. How much of an improvement would 4.10 gearing be?
  2. Crawdaddy

    Crawdaddy Thread Killer Extraordinaire Staff Member 5+ Years 1000 Posts Platinum Contributor

    Probably not a noticeable difference. 3.73 and 4.10 are too close to make it financially worth it. You're looking at around $500 a differential, so it's double if the truck is 4wd. If you wanted to move up for more torque, the next step I'd suggest would be 4.56s. However, that's pretty steep for a stock tire size. For a stock tire, you'd be looking at around a 60mph top speed.
  3. squatchy

    squatchy Member 100 Posts

    I could always tell a slight difference between my 2000 5.3 with 4.10 and my dads 04 with 3.73, but the difference certainly isnt worth a grand to regear.
  4. Six point

    Six point Member

    Up here,I would think that gear swap would be closer to $1600 plus. Might have to look at some other ways to bump up the power for trailer towing duty.Suggestions?
  5. squatchy

    squatchy Member 100 Posts

    Do you have yearly inspection/emissions?

    99'HEARTBEAT Epic Member Staff Member 5+ Years ROTM Winner 1000 Posts Platinum Contributor

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    Last edited: May 13, 2014
  7. ajarman

    ajarman Rockstar 4 Years ROTM Winner 1000 Posts

    Like Mike said a tune on the 6.oh will make a big big difference. And no way the max speed in a truck will be reduced to 60mph by going to a 4.56 gear.
  8. Crawdaddy

    Crawdaddy Thread Killer Extraordinaire Staff Member 5+ Years 1000 Posts Platinum Contributor

    It may be higher on some trucks, but speaking from experience with the military CUCVs which are Chevy diesel pickups with 4.56s and 235/85R16 tires, top speed foot to the floor bouncing off the redline is 60-65mph.
  9. ajarman

    ajarman Rockstar 4 Years ROTM Winner 1000 Posts

    I agree if the motor is diesel and its on stock tires a really low gear will bring the top speed way down.

    Here is a video of a Silverado with 4.56's and stock tires or maybe even a size smaller.

  10. RayVoy

    RayVoy Well-Known Member 2 Years 1000 Posts

    You should be able to tow between 8,000 and 12,000 lbs

    Knowing what you have for a truck would help, but with no info, I'll go with a 4 speed tranny.

    You should have a "tow" selector, and you should be able to select 3rd gear.

    And, doing this you are still having a problem?

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