Would 3.21 axle ratio be fine with Rubicon tires/rims? - Jeep Wrangler Forum
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Old 03-09-2014, 08:42 PM   #1
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Would 3.21 axle ratio be fine with Rubicon tires/rims?

Hello,

I'm having a hard time finding a wrangler sport I want with the 3.73 axle ratio. After thinking about it, the largest rims/tires I have in mind will be from a Rubicon. I may put a 2" lift with aftermarket shocks as well. Will the 3.73 be significantly better at handling that set-up relative to the 3.21? If so, I'll keep on looking.

I have no plans to go off-road. The jeep will just be used for commuting short, mall runs, etc.

THANKS

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Old 03-09-2014, 08:46 PM   #2
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You will be fine.

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Old 03-09-2014, 08:49 PM   #3
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If you're not going off-road it should not be an issue. It will however add more weight so I guess there is a chance that the Jeep could be a bit more sluggish with the larger tires, lift, etc. Maybe someone that has done this on a 3.21 could chime in though?
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Old 03-09-2014, 08:52 PM   #4
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I would think a 3.73 with Rubi wheels would run great and 3.21 might be a bit sluggish.
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Old 03-09-2014, 08:54 PM   #5
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Prius'es'es will kick your butt with that gearing. Getting into a lifted JK with a 3.21 would be like Ty Murray getting on a neutered bull. Don't get on a neutered bull. Even if you're just going to the mall. Just going to the mall….shudder.
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Old 03-09-2014, 09:53 PM   #6
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Nah, you,ll be perfectly fine with 3.21's, mines an Auto and I didn't notice any difference from my stock tires to my new ones. I did use a programmer to change the speedo and anyone driving it wouldn't think its a slug at all. If you went 35's then yeh It would probably suck. Here's mine with 285's and a 2" lift
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Old 03-09-2014, 10:02 PM   #7
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I just went through this when looking for a used jeep. This link was a great help. Just put in the vin and it will show you the ratio from the factory. They have plenty of 3.73s out there. Good luck.

http://www.jeep.com/webselfservice/B...etServlet?vin=
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Old 03-09-2014, 10:13 PM   #8
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I have 33's 3.21's and the 3.8L. Yours won't be a dog. I can still spin the tires on dry pavement and merge onto the highway, tow a trailer through mountains, and pass people. Unfortunately not all at the same time tho. With the 3.6 you'll be golden
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Old 03-11-2014, 10:56 AM   #9
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I have 2013 Sport, 2-dr, soft-top, 3.21. Upgraded to 4.5 BS wheels + 32" tires, OEM Rubi shocks w/18+58 springs. I took out 80# back seat and added Ace sliders + Rock Hard undercarriage armor + Rampage Recovery front bumper. Mine rides + handles much better than stock and I have not noticed any impact on power while getting 19.5 mpg. Enjoy the ride!
Make sure you reset computer chip when upgrading from stock Sport tires.
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Old 03-11-2014, 11:39 AM   #10
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Quote:
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I have 2013 Sport, 2-dr, soft-top, 3.21. Upgraded to 4.5 BS wheels + 32" tires, OEM Rubi shocks w/18+58 springs. I took out 80# back seat and added Ace sliders + Rock Hard undercarriage armor + Rampage Recovery front bumper. Mine rides + handles much better than stock and I have not noticed any impact on power while getting 19.5 mpg. Enjoy the ride!
Make sure you reset computer chip when upgrading from stock Sport tires.
Do you have a reference to resetting the computer chip? Pretty sure that wasn't done when I went from stock to 33s.
Thanks.
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Old 03-11-2014, 12:28 PM   #11
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This is one of those questions that comes down to personal preference. Like, if Miley Cyrus was in the room with me right now, would she annoy me? For 80% of the folks out there, the answer is yes. But hey, you might be one of the 20%.

You're really going to lift it and put mud tires on it just to go to the mall? You don't even need to do that to go offroading. I just don't get it. Why not put a wing and a fart pipe on it too while you are at it?
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Old 03-11-2014, 09:00 PM   #12
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Na, a wing would pull out of the fiberglass top, cus it'd have to be big, of course. Now, a fart pipe..humm...interesting...
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Old 03-12-2014, 05:17 AM   #13
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There should be no issue--since the Sarah comes stock with 3.21 gears and the same size tires
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Old 03-12-2014, 05:28 AM   #14
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Just wondering why you're doing all the searching and struggling to find what you really want? Just order one from the dealer and get exactly what you're wanting and willing to pay for. I wanted 3.73's too but I didn't want tire sensors or the communications package that nearly all jeeps on the lot came with. That's $750 (I think) in options I didn't need, so I got the max tow package instead.
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Old 03-12-2014, 06:56 AM   #15
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I've done a ton of research on this as well. You will be fine. I plan on getting 33s + 2.5" lift in the future and I have 3.21 gears. There's a ton of threads to scroll through, but from I've read you'll be fine with the rubicon wheels/tires
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Old 03-12-2014, 07:41 AM   #16
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You will be fine. I'm running 33"s with the 3.21 ratio with a 6 speed.
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Old 03-12-2014, 08:22 AM   #17
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Quote:
Originally Posted by jkjeeper06 View Post
I have 33's 3.21's and the 3.8L. Yours won't be a dog. I can still spin the tires on dry pavement and merge onto the highway, tow a trailer through mountains, and pass people. Unfortunately not all at the same time tho. With the 3.6 you'll be golden
How's your rpm look at the OD shift point? (40 mph on my 3.8)
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Old 03-12-2014, 10:26 AM   #18
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I had dealer do it w/6000 service.
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Old 03-31-2014, 07:55 PM   #19
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Well I bought my 13 jku with 3.21 to get mileage. Told myself I loved the truck the way it was and I'd never be THAT guy who spends obscene amounts of money on a jeep. And it worked for 6 months or so. Then the mod bug hit. Rubi wheels and tires, winch, dual exhaust, stubbied bumper, stereo system, and 2.5in lift on the way. All told it still drives great, take off and acceleration are still good but my mileage has suffered from 17-18 city to 13-14 city.
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Old 03-31-2014, 10:52 PM   #20
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This is a completely subjective question. The Rubi wheels are 32" look at the gear chart and you decide how slow you are willing to roll.
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Old 04-01-2014, 05:41 AM   #21
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You'll probably be "fine" with the Rubi tires- good chance. Also a good chance you"ll lift it and want bigger tires. Never seen a "I regret 3.73s over 3.21s" thread vs. a pretty large number of people that regret 3.21s- including myself. There is a reason you can't find 3.73s. If you're already planning on modifying get the 3.73 $500 Jeep modification protection plan. Sure I got a better deal because mine had 3.21s- and the re-gear cost me $1500.
And X2 on the gear chart.
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Old 04-01-2014, 06:11 AM   #22
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I rolled 33" Nitto Terra Grapplers (a very heavy AT) with 3.21's until recently. The Jeep ran beautifully for daily on-road driving. It had plenty of pep except maybe steeper hills. That being said, I plan on getting into some fairly intense wheeling this summer and just installed 4.10's with this and the future in mind.

Does the Jeep run better on 4.10's? Yes. Is it significant when I run to the mall? No. You will be more than fine with the 3.21's for how you will use the Jeep. You can always re-gear later like I did should it become necessary.
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Old 04-01-2014, 06:37 AM   #23
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A couple of weeks ago, I ended up finding a wrangler with the 3.73. Granted, it was a 5 hour drive one way, but worth it to me. It was also in the color I wanted, anvil.
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Old 04-01-2014, 11:18 AM   #24
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Oooohhh.....Anvil. Jealous. Enjoy!
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Old 04-01-2014, 01:53 PM   #25
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Driving a Jeep w/ 3.21 gears is like driving an YJ w/ a 4 cylinder. It can be done...but what a dog! Never heard anybody happy about having to redline every gear just to get rolling.
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Old 04-01-2014, 01:55 PM   #26
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Of course it can be done, and plenty of JK's have come from the factory with 3.21's and Rubi rims/tires.
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Old 04-01-2014, 02:02 PM   #27
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Driving a Jeep w/ 3.21 gears is like driving an YJ w/ a 4 cylinder. It can be done...but what a dog! Never heard anybody happy about having to redline every gear just to get rolling.
April fools? Seriously, how many people with pentastars have to redline to shift? I'm shifting around 2,000 rpm with plenty of power in my 6sp, and yes, I've taken it off road.
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Old 04-01-2014, 02:38 PM   #28
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My Jeep came with the stock 16" 225s. I recently went with takeoffs from a Sahara with the 17" wheel and 255/75R17 tires. My Jeep has 3.21 gears and 6spd transmission. I have no issues with the power. I am getting around 16.5 mpg with mostly city driving. My Jeep has only 750 miles on her.
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Old 04-01-2014, 10:20 PM   #29
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My Jeep came with the stock 16" 225s. I recently went with takeoffs from a Sahara with the 17" wheel and 255/75R17 tires. My Jeep has 3.21 gears and 6spd transmission. I have no issues with the power. I am getting around 16.5 mpg with mostly city driving. My Jeep has only 750 miles on her.
Since when did a Sahara come with 17's?
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Old 04-01-2014, 10:26 PM   #30
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You guys that live on flat ground, I envy you! I live in hills and mountains, I test drove a 3.21 Sahara and maybe drove it 2 miles and took it back to the dealer. Around here, you have to push the $@&% out of the skinny pedal with a 3.21 to get up a hill. So maybe it's ok in FLA. Hope to get down that way soon!

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