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Thread: 3.42 Gear Limitations for Tire Size?

  1. Top Of Page | #11
    Tranny_killer_Yoder's Avatar

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    I’ve got a 18 ram 2500 and lost the trans at 40k miles.

    Stock gears 3:42’s with 37’s toyo’s.

    Now I had a trans built to the top and currently having the truck geared to 4:10’s.


  2. Top Of Page | #12
    57buick's Avatar

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    I had 3.42 from the factory and 37" tires.

    I don't tow but you could tell it was on the edge of lugging the engine.

    I recently went to 4.88 gears and 40" tires and it feels perfect like it should from the factory.

    Attached Images Attached Images
    2015 Ram 2500 Laramie, full delete, 4.88 gears, 40" Milestar Patagonia on Method wheels AEV 3" dual sport suspension, Thuren softride coils King Shocks with resi's

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  4. Top Of Page | #13
    BlackBart's Avatar

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    Quote Originally Posted by 57buick View Post
    I had 3.42 from the factory and 37" tires.

    I don't tow but you could tell it was on the edge of lugging the engine.

    I recently went to 4.88 gears and 40" tires and it feels perfect like it should from the factory.

    With 4.88 I might be inclined to ask if ya got a top speed of about 50 mph at 2500 rpm.


    I take it the tire width is enough to compensate for the wheels turning that much slower?


    Good stuff.... Truckers bring it

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  6. Top Of Page | #14
    57buick's Avatar

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    Quote Originally Posted by BlackBart View Post

    With 4.88 I might be inclined to ask if ya got a top speed of about 50 mph at 2500 rpm.


    I take it the tire width is enough to compensate for the wheels turning that much slower?
    I think I'm turning 1800rpm at 70mph if I remember correctly?

    Truck is torn apart this week for some new mods but Ill verify that again in a few days.

    2015 Ram 2500 Laramie, full delete, 4.88 gears, 40" Milestar Patagonia on Method wheels AEV 3" dual sport suspension, Thuren softride coils King Shocks with resi's

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  8. Top Of Page | #15
    Daily Grinding! RamIt's Avatar

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    Had 35s on 3.42s with a 120hp tune; my transmission was not a fan.

    Ended up getting 6th gear shudder after awhile.

    If you're going to be towing/hauling; I'd recommend sticking with a lower power level tune.

    I have 37s on 3.73s in my 2019 without issue, but the 5th gens 68RFE has upgraded planetary sets in 5th and 6th that make a huge difference.

    2021 3500 Mega HO DRW

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  10. Top Of Page | #16
    Aj Grubb's Avatar

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    The Cummins won't care, but towing with oversize tires and stock gearing and added power the transmission is not going to like that long term.

    I would and do keep mine at the lowest power setting.


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