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Old 01-19-2020, 09:52 AM
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Hard to find 4.10 Rubicon?

I just started looking for a low-miles 2017 or 2018 Rubicon JK and every VIN that I've run shows 3.73 gears. Until I said something in a thread a few days ago, I hadn't realized 3.73 was even available on the Rubicon.

I really haven't been looking more than a few minutes, but now I'm wondering if 4.10 is uncommon, or if I've just been unlucky so far?

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Old 01-19-2020, 09:59 AM   #2
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automatic rubicons come with 3.73 standard and 4.10 option. manuals are all 4.10's.
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Old 01-19-2020, 10:12 AM   #3
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If you can find the window sticker for a particular Rubicon the standard list will show 3.73.
If you look in the right side column of upgrades the 4.10 will be listed there IF it has the upgrade.
I bought a 2016 and the only one I looked at had 4.1.
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Old 01-19-2020, 10:24 AM   #4
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3.73’s with the automatic are very common. Not a lot of people thought it was worth the $600-$700 option price for 4.10
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Old 01-19-2020, 10:28 AM   #5
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here is a nice one .
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Old 01-19-2020, 10:30 AM   #6
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here is a nice one for sale.
Still trying to sell your rig?
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Old 01-19-2020, 10:36 AM   #7
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Still trying to sell your rig?
always
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Old 01-19-2020, 10:52 AM   #8
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4.10's was worth it for a very light rig and up to 35's. Past that, forget it. Don't turn down a really nice jeep because of gears. I did that with my first jeep and now know I shouldn't have. IF you know you want a lift and 35's, regearing is about $1,200+/- depending on where you are. It is one of the best things you can do for a jeep. Having a JKUR that's all armored up and on 37's drive like a stock JK on 4.10's is fantastic.

I have a second JKUR that came with 4.10's. I have almost finished building. It has full AEV bumpers/carrier, Zeon 10-S winch, RH 4x4 full steel skids, Rock Slide steps, MC GC lift, and 35 ATZ P3's. It' fine on local trails but struggles when we have to climb a grade or get to higher elevations. When I take my other JKUR that's even more built and on 37's, it's night and day how much better than thing climbs hills with 4.88's.
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Old 01-19-2020, 12:37 PM   #9
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Don’t pass up a nice JK for gears. 4.10 are few and far between. Even the auto Recons which have 4.10 decaled on the hood has 3.73 gears.
I was lucky to find a 18 with 4.10. My take is on 35s the rpm is still running a bit high for highway speeds above 60mph. For fireroads and DD it’s just fine. Regular trail riding, sand, mud holes, and snow it does just fine. We’ll see how it handles 37” Pitbulls.
My last JK had a 3.8L w/ 5.38 gears and 37” Pitbulls. So I’ll swap gears in the 18 to 4.56 or 4.88 later if I feel the need..


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Old 01-19-2020, 12:48 PM   #10
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I purchased my new 2018 JK Rubicon two door as a leftover only 7 months ago and it came with the upgraded 4.10
I am surprised that you can’t find a comparable used one.
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Old 01-19-2020, 12:51 PM   #11
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I spent time looking before I bought …
from my memory with auto trans ,,unless its part of a package, finding any optioned up axle ratio is uncommon.
3.73 on any sport based model ie: sahara, freedom editions etc.. are hard to find
just like finding an optioned up 4.10 rubi axle is .

my guess is , since a vast majority of jeeps are ordered by dealerships ,
its just not an option they tick very often
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Old 01-19-2020, 01:29 PM
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Thanks everybody. My thinking is that I might run 35" some day, but I'll probably just stick with 33" so factory 4.10 would be ideal. Good to know it isn't common though, so I can stop fixating on that.

There are still a few nice looking leftovers out there. Slightly nervous about something that has been parked for so long, but on the other hand I had a garage full of old cars that sometimes didn't move for 6-10 months and they were always fine. (Heck, when I bought my my 55 Buick, it had been parked for three years ... the next day I overhauled the brakes and I drove it 950 miles home.)
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Old 01-19-2020, 01:36 PM   #13
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Don’t pass up a nice JK for gears. 4.10 are few and far between. Even the auto Recons which have 4.10 decaled on the hood has 3.73 gears.
I was lucky to find a 18 with 4.10. My take is on 35s the rpm is still running a bit high for highway speeds above 60mph. For fireroads and DD it’s just fine. Regular trail riding, sand, mud holes, and snow it does just fine. We’ll see how it handles 37” Pitbulls.
My last JK had a 3.8L w/ 5.38 gears and 37” Pitbulls. So I’ll swap gears in the 18 to 4.56 or 4.88 later if I feel the need..


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Exactly. I had to order mine that way. Most probably wouldn't spend the extra cash. They are few and far between.
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Old 01-19-2020, 01:42 PM   #14
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I have 4.10 gears in my automatic 2017 JK Rubicon
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Old 01-19-2020, 06:08 PM   #15
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4 Rubis on the lot when I bought mine all the others had 3.73.


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Old 01-19-2020, 08:37 PM   #16
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Just picked up a 2017 JK Rubi with 4:10's from a Honda dealer. Drove it almost 500 miles home and I thought the engine was winding way to fast at 70 MPH. About half of them I looked at had the 4:10 option. I was looking for 3:73 because its my daily driver and I take a lot of road trips. My 2015 had 3:21's and they were pure hell. Many forum members seem to think extended trips at 2800 RPM are OK. I'm not too sure about that.
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Old 01-19-2020, 08:46 PM   #17
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Just picked up a 2017 JK Rubi with 4:10's from a Honda dealer. Drove it almost 500 miles home and I thought the engine was winding way to fast at 70 MPH. About half of them I looked at had the 4:10 option. I was looking for 3:73 because its my daily driver and I take a lot of road trips. My 2015 had 3:21's and they were pure hell. Many forum members seem to think extended trips at 2800 RPM are OK. I'm not too sure about that.
2,800rpm with 3:21? What size tires did you have?

I have 3:21 in my jk, when/if I regear, 3:73 is as low as I will go.
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Old 01-19-2020, 08:54 PM   #18
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A total rip off for FCA to charge $600 for the 4.10's. They are OK but mine with 3.73's is also OK. The only other gear for me would be 4.56's.
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Old 01-19-2020, 08:55 PM   #19
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Yet another reason to buy a 6spd; they all come with 4.10s. I have to disagree with the position that 4.10s are good up to 35s; I felt the crawling really dropped off when I moved to 35s; highway was just okay with downshifting on hills. Now that I'm running 4.88s I can crawl very well and I never have to downshift on hills anymore.

Make it easy and pickup a stick; you will also have better bargaining power as the used 6spds tend to 'sit' on dealer lots much longer.
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Old 01-19-2020, 09:12 PM   #20
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Yet another reason to buy a 6spd; they all come with 4.10s. I have to disagree with the position that 4.10s are good up to 35s; I felt the crawling really dropped off when I moved to 35s; highway was just okay with downshifting on hills. Now that I'm running 4.88s I can crawl very well and I never have to downshift on hills anymore.

Make it easy and pickup a stick; you will also have better bargaining power as the used 6spds tend to 'sit' on dealer lots much longer.
That is regional - up here Used handshakers sell as fast as they are traded. I wanted one, but it was sold before I arrived to look at it.
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Old 01-19-2020, 09:30 PM   #21
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Even the auto Recons which have 4.10 decaled on the hood has 3.73 gears.
Good caution, and one of my pet peeves.


As you say, all Recons come with hood stickers which shows it has 4.10 gears, even those which actually have 3.73 gears.
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Old 01-20-2020, 12:50 AM   #22
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I lucked out. The dealer added 4.10's to my Auto Rubicon right off the lot! I actually didnt even realize it when I bought it. I knew nothing about cars really until after my Jeep purchase. Now do all my own work and mods. Just happened to find my sticker price in an old box a while ago and read that it had 4.10's ! I assumed it was 3.73 the whole time. Had to know for sure so I called Jeep to confirm and they did. Also found out little later when popping off the dana covers and cleaning out my gears.
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Old 01-20-2020, 01:18 AM   #23
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Just picked up a 2017 JK Rubi with 4:10's from a Honda dealer. Drove it almost 500 miles home and I thought the engine was winding way to fast at 70 MPH. About half of them I looked at had the 4:10 option. I was looking for 3:73 because its my daily driver and I take a lot of road trips. My 2015 had 3:21's and they were pure hell. Many forum members seem to think extended trips at 2800 RPM are OK. I'm not too sure about that.
I couldn't imagine running 4.56's or more gear
I often hear the 3.6 was built to run at higher rpms
but I don't buy it ,
its just a result of poor low end torque and having to over come it with hp

I was turning [email protected] on the stock 32's after my 4.10 regear
up from the [email protected] with the 3.21s
moving up to 34s brought me down to 2550rpm @70
in theory 35's would put you around [email protected]
and that's about the only way you will calm it down
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Old 01-20-2020, 06:01 AM   #24
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I couldn't imagine running 4.56's or more gear
I often hear the 3.6 was built to run at higher rpms
but I don't buy it ,
its just a result of poor low end torque and having to over come it with hp

I was turning [email protected] on the stock 32's after my 4.10 regear
up from the [email protected] with the 3.21s
moving up to 34s brought me down to 2550rpm @70
in theory 35's would put you around [email protected]
and that's about the only way you will calm it down
The 3.6 is ‘not’ a straight six like the 258 and 4.0. It does not make power down low. It makes its power higher up. 3.21 gears are all about FCA keeping their cafe numbers up, they have nothing to do with the power or torque ratings of the 3.6. Gearing is the only way to get better low end with this motor.
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Old 01-20-2020, 08:01 AM   #25
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Our JKU with the 3.6 has had no issues running down the highway at around 3,000 rpm. That is only half of its actual rev range, and as such it really isn't spinning very fast. I would think if you come from a world of big V8's 3,000 rpm might seem like too many rpms, but for a 4 or 6 cylinder engine it is nothing.
Some of t he smaller engined cars we have owned would spin even higher. And we won't even talk about the motorcycles....
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Old 01-20-2020, 08:50 AM   #26
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It does not make power down low. It makes its power higher up.
When the 3.6 first came out I remember seeing hp & torque graphs showing how much better it was (than the 3.8), with a very wide, flat torque curve.

Edit: Here's what I'm talking about: https://forum.aev-conversions.com/fo...worth-it/page2
That's a really flat torque curve, coming on quite low in the revs for a NA engine. But you still want to be well above 2000 rpm to take advantage of it.
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Old 01-20-2020, 08:55 AM   #27
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Thanks everybody. My thinking is that I might run 35" some day, but I'll probably just stick with 33" so factory 4.10 would be ideal. Good to know it isn't common though, so I can stop fixating on that.

There are still a few nice looking leftovers out there. Slightly nervous about something that has been parked for so long, but on the other hand I had a garage full of old cars that sometimes didn't move for 6-10 months and they were always fine. (Heck, when I bought my my 55 Buick, it had been parked for three years ... the next day I overhauled the brakes and I drove it 950 miles home.)
I felt the same way when I was shopping for mine and I sell cars for a living so I know firsthand the issues that can arise from a vehicle sitting for too long. Even a brand new one.
So far so good with mine though.
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Old 01-20-2020, 10:27 AM   #28
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I just bought (in December) a 2015 JKUR Hardrock, 6 spd, 3.6 with 4.10s which had just over 20,000 miles on it. With stock 255/75/17s I'm at about 2,900 RPMs doing just under 80 MPH and its in "eco" mode. I don't have any issues climbing hills, though I haven't been off roading yet.



My old 2010 JKUR 6spd, 3.6 with 4.10s ran just about the same (though it didn't have "eco" mode) with 255/75/17 on it. I put 285/70/17s on and didn't notice much of a difference. I had over 200,000 miles on that one before I totaled it and didn't have ANY engine issues.
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Old 01-20-2020, 10:35 AM   #29
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I have pulled a trailer all over Montana, Idaho, Colorado, Utah etc with 4.10's auto and 3.6 with 35's and never once had an issue. We have some pretty steep passes. I have had 3 JK's with 4.10 and 3.6 autos and never have i felt under or over geared. Speed limits are 75-80mph in my neck of the woods and we travel the speed limits.
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Old 01-20-2020, 12:01 PM   #30
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The 3.6 is ‘not’ a straight six like the 258 and 4.0. It does not make power down low. It makes its power higher up. 3.21 gears are all about FCA keeping their cafe numbers up, they have nothing to do with the power or torque ratings of the 3.6. Gearing is the only way to get better low end with this motor.
yea exactly where a jeep "DOSEN'T" need it .
pretty much the reason people are rolling around at half throttle(3k) trying to just maintain highway speeds
don't get me wrong , the 3.6 is what it is
its a durable motor and while it was a few small warts it will run for several 100thousand miles.
but its a bastard marriage in the jeep platform

the torque curve is broad and flat , but its anemic and only looks good compared to the 3.8
its all in by 2000rpm and after that your relying on HP numbers in a 1-1 exchange.
the HP of a 3.6 is adequate ,but it doesn't start showing up till later in the curve.
this gap between the 2 power bands leaves a big dead spot in the middle power curve... right in the cruising range
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