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Hard to find 4.10 Rubicon?

8K views 97 replies 35 participants last post by  vanhalo 
#1 ·
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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#2 ·
automatic rubicons come with 3.73 standard and 4.10 option. manuals are all 4.10's.
 
#37 ·
I just looked at my 2015 sticker that I have framed.
Only reference to 4:1 Rock Trac, not the grears in the diffs. I have the 6 speed manual with the 4.10 gears as an optional order buit not listed on the sticker.

Go to the Jeep Build Link to determine your optional equipment.

http://jeepsies.com/jeep-build-sheet/
Drop down to the "LINK" button
input your VIN and use ALL CAPS for letters
 
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#5 · (Edited)
here is a nice one .
 

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#8 ·
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.
 
#9 ·
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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#11 ·
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
 
#12 ·
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.)
 
#16 ·
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.
 
#18 ·
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.
 
#19 ·
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.
 
#20 ·
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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#22 ·
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.
 
#57 ·
I searched a half dozen dealers in SoCal before I bought my '16 Rubi. It's an auto with 4.10's. Every auto Rubi I looked at had 4.10's. When I picked it up I asked the dealer why they ordered them with 4.10's. Answer: "Because we know you're going to get a lift and bigger tires"
 
#25 ·
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....
 
#28 ·
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.
 
#29 ·
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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#33 ·
all rubicon manuals come with 4.10
 
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#40 ·
When I ordered the Hard Rock edition I had to ask for the 4.10 ratio gears as it was an option. I believe we had that option but I might have to go back to my brochures...
 
#46 ·
that little green bar and dashes do have a meaning ,,,
and it has nothing to do with the ECO indictor.

the green bar indicates the operating range you'll get best economy for power output.
its basically where your torque curve plateaus
then you get the green dashes ...
these are area of transition in the power curve.torque actually dips I bit as the HP numbers climb
but your still getting pretty good economy for power out.
once your past the green dashes your relying on raw HP to push you along.
to make that extra HP you need to crack the throttle more, economy drops.

the ECO light on the other hand is a engine load sensor,
an on/off vacuum gauge
if the engine is under light load/high vac it comes on
if motor is under a high load /low manifold vac it goes off
 
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#48 ·
#49 ·
only on the manual is 4.10 standard. Auto recon 4.10 is an option just like every other rubicon edition.

you sound like a candidate for ride and drive hoe :)
 
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#61 ·
makes me feel like mine is priced right then as mine msrped $50310, has a warn winch, bull bar, skids quality lift components, grabars, headliners, AEV rims. more miles but cared for miles.
 
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