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Thread: Which gears, 4.10 or 4.56?

  1. #1
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    Which gears, 4.10 or 4.56?

    I'm in the middle of planning some mods to my TJ and I need opinions from the "experts" on JK as to what gear ratio I should go with. Here's some background. I have a 2002 TJ with stock 3.07 gears and 33's with D30/D35 axles. My Jeep is basically a "Mall Crawler" since I haven't wheeled it in a long time. 98% of my driving is city driving to and from work with the odd trip to St. Catharines to see my folks.

    I wanted to regear to 4.10 gears with the goal of getting my Jeep back to feeling like stock but after speaking with a JK member who also has a 2002 TJ he said if he had to do it all over again he would have gone with 4.56 gears instead of 4.10's with 33's. My buddy tells me I may not want to go with 4.56 gears. He's got a Landcruiser with a 4 cylinder diesel with 37's and 4.56 gears and he says "he runs out of gear on the highway"

    So what gears should I go with and why? I'm waiting on quotes from some shops for the work I need done and their quotes are based on 4.56 gearing so I would appreciate some opinions before I drop a load of cash on my Jeep.
    Last edited by TOYJ; 04-09-2011 at 01:04 AM.
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  2. #2
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    for your quotes, I can't see the gear ratio making a big difference in price, the majority of the price is labour. Do you have an auto or 5 speed, this will help people help you, but I say why worry about the cost of a regear which will likely run you in the $1500 range. There is plenty of 4 cylinder/5 speed TJs out there that came factory with 4.10s that would be a bolt in swap that you could likely do with a little help from some friends. The cost of a pair of these axles used is usually around $200 - $400...that would leave you at least $1000 for other mods, or to keep in your pocket.

    In my opinion, if standard trans 4.10s is the way to go, if auto with overdrive then 4.56 is the way to go.
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    A few considerations are that the Land Cruiser might not have an overdrive gear in the trans on the highway (?), older diesels don't like to rev up too much, and importantly for re-gear quotes it shouldn't matter 4.10 or 4.56. The gears are the same price anywhere I have seen lists, and you will need new carriers coming from 3.07s for either scenario.

    One vote for 4.56, but I think you know that.

    Maybe someone local has a TJ with 33's and either 4.10 or 4.56 gears you could take for a spin?

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    Yeah, forgot to mention my TJ is manual transmission. I know the pricing for gears at JJ is standard regardless of the ratio so that's not a huge issue, I just want to make sure I'm regearing according to my needs. I thought about an axle swap because it would be cheaper but I also don't know what I'm getting. At least with the regear I know the parts are brand new and have been installed by a qualified mechanic at a 4X4 shop. If there was someone local that had a Jeep with 4.10 or 4.56 gears with 33's I wouldn't mind test driving it but I don't know anyone with those specs. I'm hoping the input from JK members will help me make a decision.

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    Not offering up their Jeeps for test drives, but I know Craveneh has a 6 cylinder (can't remember if it's auto or standard) and he swapped to 4.10s with 33s and loves it...Plowboy has a 6 cyl standard and is getting ready to do a 4.10 swap very shortly. Cowboys666 is running 35s with 4.56 on a 6cyl 5 speed...

    Maybe you could shoot those guys some PMs and see what they think.

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    Quote Originally Posted by Jak Flash View Post
    Not offering up their Jeeps for test drives, but I know Craveneh has a 6 cylinder (can't remember if it's auto or standard) and he swapped to 4.10s with 33s and loves it...Plowboy has a 6 cyl standard and is getting ready to do a 4.10 swap very shortly. Cowboys666 is running 35s with 4.56 on a 6cyl 5 speed...

    Maybe you could shoot those guys some PMs and see what they think.
    Yeah, sounds like a good idea as I basically want opinions from more experienced members who may have done the regear and get their thoughts. Hustler has been great with his advice and input but I don' t know enough about this stuff to say he's right or my buddy is right. I'm sure I'd be happy with either but I don't know enough about the pros and cons of either so I'm looking for some guidance. Thanks for your input Jak Flash.

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    I went 3.07 with 33 (brutal) to 5.13 with 37 (Awesome all around) and have now moved to 5.38 with 37's (axles geared for 42's)

    Gearing is your friend and its expensive enough you don't wanna do it all that often or know that you left some more drive ability out there


    Easy for me to say maybe cause I do not give a shat about mileage or DD

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    Yeah, I lived with 33's and 3.07 long enough and it is brutal so I've decided it's finally time to regear. I only plan on doing this once because it is so expensive and that's why I want to get it right.

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    I went from 3.07's to 4.56's in my 99 TJ with 5 spd on 33's I think it is perfect. As I am mostly cruising at 90 - 100 kph highway I would not have been happy with 4.10's. If you are going to be on 400 series doing 120+ then 4.10s might be the way to go.

    The 4.0 L likes to be at 2400 - 2600 for cruising at speed, use this calculater to see what rpms you will be at.

    http://www.grimmjeeper.com/gears.html

    Where in Toronto are you? I work in Brampton, if we can find an appropriate time you can try out the 4.56's
    Last edited by pillswoj; 04-09-2011 at 09:03 AM.
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    like jak had mentioned i was stock gearing 373's,tires 30's perfect power was always there when you needed it,went to 33's was ok but 5th gear was very sluggish going on a incline(say burlington skyway)regearded to 456's and 33's was way better,power in every gear,uphill was great,no problems to mention,then went to 35's and a lngarm kit,power was still there but not as good with the 33's,all in all very happy with the gearing and 35's though.
    i'm sure the 410's would be adequet for your daily drive but you would be changing carriers anyways so you might want to upgrade now other then doing it again down the road..my 2 cents goodluck with whatever you do.
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    My TJ 4.0L 5 speed 33's and 4.10 gears wicked all around. I believe 4.56 is too much gear for 33's and I think the 4.56 is the way to go when running a 35..

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    Quote Originally Posted by JEFF20v View Post
    My TJ 4.0L 5 speed 33's and 4.10 gears wicked all around. I believe 4.56 is too much gear for 33's and I think the 4.56 is the way to go when running a 35..
    you might be right, but i was thinking ahead,so i saved a bunch of money,not having to do it again.

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    To get back to factory performance, all you really need are gears close to 3.50:1, assuming you had 29" tall tires stock. [29"/3.07]=[33/x] x=101.31/29 x=3.49
    I think 3.54 or 3.73 were the gears on 6cyl automatics? 4.10 would be an improvement should you make it back to the trails though for now you would burn more gas on the highway with them. 4.56 would be more suited to a 4cyl jeep with 32's or 33's that started off with 4.10's from the factory. Again, my calculation is just to get you back to stock performance.

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    Stock Rubi is 4.10 and 32s.... If your at 33"and ever plan on anything bigger I would go for 4.56 with out a second thought.
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    I won't be going to 35's. I've already looked into that and it's waaaay too expensive if I want to do it right so I've decided regearing and keeping the 33's is the way to go for me.

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    Quote Originally Posted by JEFF20v View Post
    My TJ 4.0L 5 speed 33's and 4.10 gears wicked all around. I believe 4.56 is too much gear for 33's and I think the 4.56 is the way to go when running a 35..
    Really?

    My 35" tires with 4.88 gears and an NV-3550 feel excellent. Get yourself (or borrow) a Scangauge and see how many L/100km you're using instantaneously. Less RPM does not always equal less fuel use. I think the 4.0L is most efficient at something like 2400 RPM.

    FWIW, you can approximate a gear swap by using a good calculator that actually allows you to input gear ratios for 4th and 5th gear, then just leave your Jeep in the corresponding gear on the highway. When I had 3.07s and 32" or 33" tires I felt a gear and a half away from where it should have been. Getting back to "stock" is tricky - I would shoot for the same final drive as a 29" and change tire on a 3.73 axle gear.



    Edit: Also worth a mention is that if you ever end up going to 16" or better yet 17" rims, there are a lot of tires bigger than a conventional 33" and smaller than a 35".

  17. #17
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    not a tj but my yj on 33's with 4.10's with a 4.0L and 5 spd is slightly over geared. i definately wouldnt want 4.56's on the highway. right now i cruise at 120km/h in 5th at 2500rpm which is as close to perfect as you can get if you ask me.

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    I had the same dilema years ago when I regeared. I was running 3.55's and 33's and 5th was almost useless. I decided on 4.56's because I still wanted better low end for the trails, but if it's mostly highway I think 4.10's would work well. At 110km/h I'm running about 2700 rpm, which if Iwas DD the Jeep this would be a little higher than I would like. For what I use my Jeep for I love the 4.56's, but you need to decide what your use is and what compromises you can live with. Cost wise I agree it should be the same. What speeds do you usually travel at? How much trail use will you see? For me I don't go over 110, in the Jeep, so 4.56 is OK, but if I went to 120 or more it would get to be too much, I'd be running around 3000 rpm in 5th gear.

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    I loved my 33's and 4.56's when i had them.
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    Ted, in order for this to be a direct apples to apples comparison you would also need actual tire diameters. Tires are really the final drive "gear" in the equation.

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