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Thread: Should i go from 3:73s to 4:10s in my TJ

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    Should i go from 3:73s to 4:10s in my TJ

    My 35 has been suffering for a while now. the rear swaybar has snapped 2 bolts in the axle and now my bushings are all worn out. The seal is leaking and i need new brakes all around. i have searched for a replacement bolt-in 35 or 44 off and on for quite sometime but 3:73s are scarce. So at this point i am thinking of just picking up a set of 4:10 axles and refreshing them. My drivetrain is 4.0 with the dreaded 3 speed auto. Would the 4:10s affect my driveability much since i only put about 5K a year on the Heep? My commute is 10km each way on city streets daily with rare highway driving except to and from wheeling trips. what are your thoughts?
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    What size tires are you running?

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    oops sorry 4 inch lift with 33's

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    Should i go from 3:73s to 4:10s in my TJ

    If you have the option to go with 4:10s you should just do it. You will never regret it.
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    For the driving you do I bet you would get better fuel mileage and drivability with the 4:10 gears. I run 33s 4:56 gears and a ax-15 5 speed and it's perfect in my Comanche.
    Last edited by misfitmechanic; 05-14-2016 at 07:13 PM.

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    3.73 to 4.10 isn't much of a difference and in most diffs you are now at a case break so need to replace the diff case (carrier) anyway - might as well go 4.56.
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    i was thinking of a set of axles to refresh as opposed to a gear upgrade. 4:10 axles are alot more plentiful and cheaper

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    4.10 is more better

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    Thanks for the input folks. I figured 4:10 was the way to go but wanted to hear if there was a downside to that decision. Looks like 4:10s are in my near future. anybody have a TJ set laying around?

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    Should i go from 3:73s to 4:10s in my TJ

    Buy a 99 explorer rear axle with a set of 4.10 gears in it at a Kenny u pull for under 150$ and a kit to put control arms on it from TMR or the likes. It's a fairly easy upgrade. Source a D30 ready to go and you're mint for a long while

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    but the Explorer 8.8 (which i hear is a tuff axle) would also include bracketry and brake changes and a driveshaft change as well. All that stuff adds up and for the limited and medium trails that i roll on, a direct swap to 4:10s with a 30 and 35 would be in my wheelhouse for mechanical ability. A 44 would be sweet if possible but rare i believe. She is a 1997 and probably doesn't have a lot of years left in her and i would rather spend the extra money on tube fenders and new tires. Thanks for the input tho.

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    I'll give you my 2 Roy,
    I did the Dana 30 & 35 swap with the 4:10 axles,
    sweet for putting around trails and the city, but no gear left for the highway,
    I'm cruising at 3000 rpm going 100 kph,
    if i was to do it again, i would prolly go to 3:73, for a nice median for highway and city.

    I am currently refreshing a Dana 44 rear, its sitting in Curt's basement, new carrier, new brake cylinders, pads and rotors,
    just needs gears and pinion seal. I might be convinced to sell if the offer was ridiculous.

    Billy

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    OK here goes, 2 cents is my offer. Hey you said ridiculous. LOL. About the only time the TJ goes on the highway is when it is on the way to wheeling.

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    OK first off how do you have 3:73's the auto should have 3:07's just like the manual unless your a 4 banger auto then I can see the 3:73's...

    If you have a 4cyl and 3:73's then the swap to 4:10's will not be much of a swap and not worth wasting the money just fix your busted D35 because you will have to change the bushings anyways since they are in the control arms and seals and brakes are basic maintenance anyways and will likely be needed on the replacement axles...

    With the Auto its more forgiving then a manual so other then needing more HP its not going to be a big deal...

    I ran my CJ with on 35's with a 6Cyl 4.0L (a couple bolt on power adders) and the TF999 (basically the same 3 speed you have now internally that is) with 3:31 gears and it was spectacular all around, nice low RPM's in the city and highway averaging over 600K per tank of fuel.. But I drove that Jeep like a grandpa and evern though I could do 180KPH I was happy putting around at the speed limits...
    1989 Jeep MJ: 4.7L Stroker, 4WD Swap, 97+Conversion, RC Long Arm Upgrade Kit, 35x12.5x18 Mickey Thompson MTZ's, WJ D30, WK SRT8 Rear D44 w/approx. 8" Lift
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    Ok the long story is i already re-geared years ago to 3:73s when I lifted it and put the 33s on and my Friend installed a Lockright locker and re-geared at the same time. Now my 35 is shot and I have had a helluva time finding a decent 35 with 3:73s in it. At this point i would like to just get on with it and pick up a set of axles, clean them up with fresh parts like brakes and bushings that I can manage. I don't know anything about gearing and the cost is not worth it to get it done. So that is why it is what it is.

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    OK that makes a lot more sense now...

    First off I would figure out the Jeeps main purpose in life and then gear accordingly if possible...
    This site can help you figure out what gears you should have if you care to know or at least to see what the RPM's will change to with the 4:10's
    http://www.grimmjeeper.com/gears.html

    Otherwise you can search
    car-part.com
    and see if you can find an axle in the Junkyards that suits your needs for a bolt in...

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