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Old 08-24-2011, 08:52 PM
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2011 Sport—How can I find out what gears I've got?

Sorry if this has been discussed a lot; a search didn't turn anything up. I just bought a 2011 Wrangler sport, 6spd, which came with some puny 225/75/16 tires. I'm looking at some 265/75/16 Goodyear Wranglers, but I'm not sure how badly this will effect my acceleration. Would my gear ratios be different if I'd gotten a model with bigger tires?

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Old 08-24-2011, 08:59 PM   #2
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Look at your window sticker.

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Old 08-24-2011, 09:04 PM   #3
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If you've got an manual 99% chance you have 3.21 gears.
If you've got an auto 100% chance you have 3.73 gears.
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Old 08-25-2011, 05:29 AM   #5
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If you don't have the window sticker, request a build sheet. I'm betting you were perfectly happy not knowing until you started reading this forum!
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Old 08-25-2011, 05:34 AM   #6
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If you have a 6 sp and 3.21's, you probably won't be happy with the larger tire without a re-gear, IMO.
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Old 08-25-2011, 06:03 AM   #7
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If you don't have the window sticker, request a build sheet. I'm betting you were perfectly happy not knowing until you started reading this forum!
lol

awesome!

but I bet they learned so much--I know I have!
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Old 08-25-2011, 09:37 AM   #8
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If nothing else works out you can always take them out and count the teeth. Ring gear teeth/pinion teeth=ratio.
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Old 08-25-2011, 09:47 AM   #9
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Drive at 70 mph and remember your RPMs.

Then look at this chart. The manual transmission version is the bottom one. Find your tire size, scroll across to find your RPMs at 70 mph, and then look up to find your gear ratio.

Unless it's been regeared, you'll have either 3.21s or 3.73s.
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Old 08-26-2011, 03:55 PM
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Thanks for the info everyone. It sounds a bit disappointing, but I'll grab that build sheet and make sure.
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Old 08-26-2011, 09:03 PM   #11
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OK: NEWBE too. Whats the "issue" with the 3.21's w/ the 6 spd? It seems like many here hate this set up.

I find I have pleanty of zip, great milage, tows my boat easy and while zero acceleration in 6th, 4th provides great GO! I don;t drive this over 65/70, if I want to go fast I take the wifes Volvo (that sucker flys)....so why low opinion of the 3.21's???? Honest, I just don't get it......(yet)......
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Old 08-26-2011, 09:16 PM   #12
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^^It's just that 6th shouldn't be as useless as you've observed, so the 3.21s really don't take advantage of the trans like they should. The issue is compounded if you have a 4 door, with the added weight.

Numerically higher gearing means the engine runs higher RPMs, putting some more juice at the wheels--4.10s standard would've more properly used the powerband on manuals, and 4.88s for autos. You'd actually have some modest acceleration in 6th gear if you had 4.10s, for example.

But ultimately, with a manual, you can just keep it in 4th on the highway to make up for it. So it's not a big deal. Though I will say it's odd doing most of my 70 mph commute in 4th gear.

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Old 08-27-2011, 12:30 PM   #13
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Jack it up, put it in neutral (chock the fronts) and for one complete turn of the rear wheel, the driveshaft should turn 3.21 or 3.73 times. The difference is half a revolution and should be noticable.
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Old 08-27-2011, 12:48 PM   #14
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Quote:
Originally Posted by ESP123
If you've got an manual 99% chance you have 3.21 gears.
If you've got an auto 100% chance you have 3.73 gears.
I've got that 1% for the 6-speed!! I made sure of it before buying though. Dealer took a bit to find it. It made 1st gear kind of useless until I upgraded to 33's from the tiny stock tires. Now it feels just right with a 3.73's/6-speed/33's combo.
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Old 08-27-2011, 01:17 PM   #15
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OK: NEWBE too. Whats the "issue" with the 3.21's w/ the 6 spd? ....
3.21's in 4L and 1st gear WAAY too high geared for the type of crawling that I like to do with the stock 32's on my Sahara; I will be going down to 4.56's sometime this winter, and keeping the 32's
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Old 08-27-2011, 09:05 PM   #16
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Wink

Thanks, I understand now. Ya, 6th really is for flat crusing but I do so love the MPG's I'm getting.

I traded a Nissan Frontier CC Supercharged and that truck would only hit 17 mpg if you pushed it off a building.

I'm getting 21.4 average with 1100 miles on my Wrangler and loving that I can feed it 87 vs the 92 my Nissan loved.

Thanks for the responces.....I too find 4th very handy, 5th ok for country type back road driving and 6th for long runs on the interstate. all in all I love this dam thing!!!!
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Old 08-28-2011, 10:32 AM
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Well, I found my window sticker. As expected, I've got the 3.21 gear ratio. Is this something I can change without voiding my warranty?
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Old 08-28-2011, 10:42 AM   #18
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Well, I found my window sticker. As expected, I've got the 3.21 gear ratio. Is this something I can change without voiding my warranty?
Nothing "voids" your warranty other than odometer tampering. You can change the gears easily enough, but the gears will not be covered underwarranty. This won't be cheap. New carriers, gears, bearings and install kits alone will be $1200-1500. Then you'll need to get them installed and that will be another several hundred dollars unless you can find a mechanic that doesn't value his time or owes you a favor.
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Old 08-29-2011, 02:25 PM   #19
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Originally Posted by cu in oz View Post
Thanks, I understand now. Ya, 6th really is for flat crusing but I do so love the MPG's I'm getting.

I traded a Nissan Frontier CC Supercharged and that truck would only hit 17 mpg if you pushed it off a building.

I'm getting 21.4 average with 1100 miles on my Wrangler and loving that I can feed it 87 vs the 92 my Nissan loved.

Thanks for the responces.....I too find 4th very handy, 5th ok for country type back road driving and 6th for long runs on the interstate. all in all I love this dam thing!!!!


I'm getting about 20 mpg average too. I just thought it was because I like to coast into stop lights and signs.

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