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Unread 09-04-2012, 07:17 PM   #1
JT29
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Join Date: Mar 2004
Location: So Cal
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JK Questions

I currently have an YJ, and thinking about buying a JK, but I have some questions? I would purchase a 4 door hardtop with the I6 and it will be a daily driver.

1. I would like to run 35" tires. Would I need to re-gear it?
2. What size lift would I need for 35" tires?
3. What kind of gas mileage would I get?
4. Can you flat tow a JK?
5. What is the base weight of a JK?
6. Any driveline/axle issues to deal with, with lift and tires?
7. How much (LBS) can a JK tow?
8. Compared to the YJ is the JK quieter sound wise with a hardtop on the road, and more car like?

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Unread 09-04-2012, 09:39 PM   #2
janders82
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2010 JK Wrangler 
 
Join Date: Aug 2011
Location: Atlanta, GA
Posts: 685
Quote:
Originally Posted by JT29
I currently have an YJ, and thinking about buying a JK, but I have some questions? I would purchase a 4 door hardtop with the I6 and it will be a daily driver.

1. I would like to run 35" tires. Would I need to re-gear it?
2. What size lift would I need for 35" tires?
3. What kind of gas mileage would I get?
4. Can you flat tow a JK?
5. What is the base weight of a JK?
6. Any driveline/axle issues to deal with, with lift and tires?
7. How much (LBS) can a JK tow?
8. Compared to the YJ is the JK quieter sound wise with a hardtop on the road, and more car like?
I have a 94 YJ and just bought a JKU with hardtop. The JK is a completely different beast and you're gonna love it!
1 & 2. I currently run 33s with no lift. If you're going to hit the trail with 35s a 2.5" should work great. Regear depends on manual or auto and what the JK currently has. I'll be going with 5.13s once I move up, but I'm going with 37s next time around,
3. Gas mileage varies
8. My JK is much quieter with 100% improvement when it comes to road manners than the YJ!!! There's really no comparison

You'll find a lot of your answers in the FAQ section in the JK Tech Forum
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Unread 09-04-2012, 11:34 PM   #3
COLOUXJ
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2010 JK Wrangler 
 
Join Date: Mar 2009
Location: Colorado Springs, Colorado
Posts: 2,005
Quote:
Originally Posted by JT29 View Post
I currently have an YJ, and thinking about buying a JK, but I have some questions? I would purchase a 4 door hardtop with the I6 and it will be a daily driver.

1. I would like to run 35" tires. Would I need to re-gear it?
2. What size lift would I need for 35" tires?
3. What kind of gas mileage would I get?
4. Can you flat tow a JK?
5. What is the base weight of a JK?
6. Any driveline/axle issues to deal with, with lift and tires?
7. How much (LBS) can a JK tow?
8. Compared to the YJ is the JK quieter sound wise with a hardtop on the road, and more car like?
First there is no I6 in any JK.

1) Depends on if you get 4.10's or 3.73 gearing
2)2.5 is what is recommended for 35" from what I have seen.
3)16? depends on a lot of different things.
4)Yes
5)JK-4k? JKU-4300ish
6)Have not heard of too much other than death wobble with the stock track bar on some JK's
7)3500
8) Its quieter than my grandpas 06 toyota camry even with MTR's
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Quote:
Originally Posted by cyberpyrot View Post
is it a plink plink kerrrrdunk? or more of a brrrrrconk doc doc miiiidge pang!!!? or is it a badonk ka donk? if it is the latter its just the normal fat *** of the JK

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Unread 09-05-2012, 08:04 AM   #4
JIMBOX
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2008 JK Wrangler 
 
Join Date: Oct 2008
Location: NORCAL/NORNV
Posts: 4,936
I have an '08 JKUR-modified-


Quote:
Originally Posted by JT29 View Post
I currently have an YJ, and thinking about buying a JK, but I have some questions? I would purchase a 4 door hardtop with the I6 and it will be a daily driver.

1. I would like to run 35" tires. Would I need to re-gear it?
2. What size lift would I need for 35" tires?
3. What kind of gas mileage would I get?
4. Can you flat tow a JK?
5. What is the base weight of a JK?
6. Any driveline/axle issues to deal with, with lift and tires?
7. How much (LBS) can a JK tow?
8. Compared to the YJ is the JK quieter sound wise with a hardtop on the road, and more car like?
1)-With auto--YUP
2)-Not required if flat fenders used--but 2.5 is suggested
3)-better/w regear-abysmal without
4)-YUP
5)-A JKU is about 4350lbs, mine is 5200lbs
6)-not for a while if driven easily, but uni's and steering will degrade much faster
7)-3500lbs-JKU
8)-Not carlike-ever- but a little quieter, but hardtop insulation is required for the ultimate quiet, for freeway/music/wife advice and backseat driving/easy cell phone use/easy CB use !!!

If you getta 2012/2013-forget items-1/3/6/

Good luck

JIMBO
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Unread 09-05-2012, 04:33 PM   #5
HappyTrails
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JIMBOX pretty well covered it.
I'd add to #6: sleeve and gussets on the front axle if going to 35's and above, especially if going off-road.
Anything over 3" lift, you're looking at new driveshafts, due to the boot getting torn off.

Overall, the JK is the closest Wrangler Jeep has created that resembles a car-like experience. By no means is it a car, it still feels much like a Wranger, but more stable and better handling than previous generations.
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Unread 09-05-2012, 04:40 PM   #6
HOKIES2010
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2011 JK Wrangler 
 
Join Date: Jul 2010
Location: Navarre Beach, FL
Posts: 1,728
Quote:
Originally Posted by HappyTrails
JIMBOX pretty well covered it.
I'd add to #6: sleeve and gussets on the front axle if going to 35's and above, especially if going off-road.
Anything over 3" lift, you're looking at new driveshafts, due to the boot getting torn off.

Overall, the JK is the closest Wrangler Jeep has created that resembles a car-like experience. By no means is it a car, it still feels much like a Wranger, but more stable and better handling than previous generations.
If you sleeve it go ahead and do gears at the same time, it saves labor.

The drive shaft boot is really only an issue with autos. Upgrade those when it brakes. Id personally spend the cash on axle shafts instead. I got drive shafts and I still have the stock front in at the moment and it's doing fine with a 3.5 lift and 37s.
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