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Old 04-08-2012, 03:25 PM   #1
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6th gear no longer works

I recently put on 35" BFG and a 2" lift on my 2012 Wrangler, and now my speedometer/odometer is out of place, and when I shift into 6th gear I do not have enough power to keep my jeep moving.
My main concern is getting into 6th gear. What do I new to do?

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Old 04-08-2012, 03:35 PM   #2
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Quote:
Originally Posted by Americanalex
I recently put on 35" BFG and a 2" lift on my 2012 Wrangler, and now my speedometer/odometer is out of place, and when I shift into 6th gear I do not have enough power to keep my jeep moving.
My main concern is getting into 6th gear. What do I new to do?
Well unfortunately those tires might be too much for your gearing. You could regear if you really want to spend the money. You could go to 4.56 gears for 1-2k or you can settle for no 6th gear

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Old 04-08-2012, 03:47 PM   #3
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Quote:
Originally Posted by jkjeeper06 View Post
Well unfortunately those tires might be too much for your gearing. You could regear if you really want to spend the money. You could go to 4.56 gears for 1-2k or you can settle for no 6th gear
X2

Also, you can re-calibrate your speedometer with an AEV ProCal.
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Old 04-08-2012, 03:51 PM   #4
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Would it help if I put in a whole intake system and exhaust? What about alloy wheels? Right now I have 16" steel wheels on it.
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Old 04-08-2012, 03:53 PM   #5
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What gears do you have.
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Old 04-08-2012, 04:03 PM   #6
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Put 4:88's in it & let it rip.
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Old 04-08-2012, 04:08 PM   #7
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@kik I have the stock gears. Idk what size they are.
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Old 04-08-2012, 04:09 PM   #8
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Do you shift based on speed (MPH) or RPMs? 5 gear is the 1:1, 6 is .76:1 ( I think), so I would find it hard to believe that 2700 rpm in fifth, or higher would not provide the power needed to sustain in 6. Not having the acceleration in 6 I could believe.
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Old 04-08-2012, 04:11 PM   #9
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Quote:
Originally Posted by Americanalex
Would it help if I put in a whole intake system and exhaust? What about alloy wheels? Right now I have 16" steel wheels on it.
The alloys might help a bit, perhaps. But not enough to make it like it was.

You need to regear. If your main concern is making 6th gear usable, that's the only real option.
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Old 04-08-2012, 04:15 PM   #10
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Here's a good thread that answered allot of my questions on this issue:

http://www.wranglerforum.com/f5/35s-...rs-150430.html
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Old 04-08-2012, 04:17 PM   #11
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If you have steelies and a stick shift you most likely have 3.21 gears. I would NOT waste your money on intake and exhaust things. If you want it to sound better then do it but it won't increase performance. Gears might be the only thing that'll help. 4.10 would be good but 4.56 would be great and you would actually have passing power in 6th.
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Old 04-08-2012, 05:50 PM   #12
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Quote:
Originally Posted by smaxberry View Post
Do you shift based on speed (MPH) or RPMs? 5 gear is the 1:1, 6 is .76:1 ( I think), so I would find it hard to believe that 2700 rpm in fifth, or higher would not provide the power needed to sustain in 6. Not having the acceleration in 6 I could believe.
^This.
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Old 04-08-2012, 06:23 PM   #13
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Originally Posted by Americanalex
@kik I have the stock gears. Idk what size they are.
Do you know the package that your jeep came with. Not seeing 'RUBICON' on the side you are either 3:21 or 3:73. And if you have the tow package you should have the 3:73. If you still have the window sticker, that will say, or if you live near where you purchased, they might be able to look you based on vin. Or, you could do math pick a speed in fifth, note speed and rpm, calculate how many rev per mile your tire makes and compare to your rpm of engine. The closer to exact measurement on tire will give you the closet number to diff. Exact height x pi = circumference of tire, then divide that by 12 then divide again by 5280.
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Old 04-08-2012, 07:19 PM   #14
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Just go to www.jeep.com click on the owners section, type in your VIN, and view your build sheet.
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Old 04-08-2012, 07:56 PM   #15
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^^^Do what daggo said...but if you're in a '12 and having that much of an issue with 6th (can't pass in 6th, or go up hills, etc) I'd be willing to bet you have 3.21 gears.

I have 3.73's, and get a little bit of it, but not as bad as what yours sounds like.

As others have said, skip the CAI and exhaust pipe crap. The only thing that's really gonna give you 6th gear back is regearing.

Want 35s dont want to REGEAR ??
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Old 04-08-2012, 09:33 PM   #16
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I have the 2012 Sport. I want to say its 3.21 but I'm not 100% sure.
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Old 04-08-2012, 09:34 PM   #17
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Well then, take ten minutes and look it up and you will be sure.
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Old 04-08-2012, 09:52 PM   #18
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Read and understand the post that kb and daggo offered up for you and you will probably decide to go with 4.88 gears. In the mean time stop shifting at 4th and enjoy the ride. While getting up to highway speed run the rpms up to 4000-4500. Going from first to second and second to third you will be up into the sweet spot of power and your jeep should run a lot better.

Now having just wrote that I just remembered you have a 12. I'm not sure if these numbers still apply.

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