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Unread 12-30-2012, 08:41 PM   #1
Jeep4L1fe
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How much will performance suffer with a lift and tires?

Right now my daily has a hemi with a good number of bolt-on power adders. I do have a 4 cylinder YJ which is a dog compared to the hemi. My grandfather had a 2012 JK Sahara.... It had decent power compared to the 2.5 in our YJ, but still nothing compared to my hemi. My question is how much of a difference would a 3-4" lift with 35s affect power with the 3.6 in the new JKs? Is it gonna feel like my YJ?

Thanks !

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Unread 12-30-2012, 08:53 PM   #2
nwpipelayerxj
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Quote:
Originally Posted by Jeep4L1fe
Right now my daily has a hemi with a good number of bolt-on power adders. I do have a 4 cylinder YJ which is a dog compared to the hemi. My grandfather had a 2012 JK Sahara.... It had decent power compared to the 2.5 in our YJ, but still nothing compared to my hemi. My question is how much of a difference would a 3-4" lift with 35s affect power with the 3.6 in the new JKs? Is it gonna feel like my YJ?

Thanks !
Regear or S/C maybe.
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Unread 12-31-2012, 07:26 AM   #3
jstrubberg
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What year is your rig?

If it's pre-2012, yeah, you're gonna feel it. 2012 and up, if it has 4.10s you'll be fine.
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Unread 12-31-2012, 07:42 AM   #4
Jeep4L1fe
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Quote:
Originally Posted by nwpipelayerxj View Post
Regear or S/C maybe.
I'd consider a regear, but the S/C is expensive.
Quote:
Originally Posted by jstrubberg View Post
What year is your rig?

If it's pre-2012, yeah, you're gonna feel it. 2012 and up, if it has 4.10s you'll be fine.
Well I don't own a JK yet, but I'm considering getting one.
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Unread 12-31-2012, 08:08 AM   #5
Walle
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Regear! I run a 4" lift an 37" tires with 5.13s. I can run 80 on the highway with ease. Plus I have a bunch of weight in bumpers, rails, etc.
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Unread 12-31-2012, 08:45 AM   #6
Jeep4L1fe
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Regear! I run a 4" lift an 37" tires with 5.13s. I can run 80 on the highway with ease. Plus I have a bunch of weight in bumpers, rails, etc.
Never really thought about regearing... makes sense! Do you feel bogged down at all or did the regear really help?
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Unread 12-31-2012, 09:18 AM   #7
Walle
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Originally Posted by Jeep4L1fe View Post
Never really thought about regearing... makes sense! Do you feel bogged down at all or did the regear really help?
I don't feel bogged down. With the stock 3.21s...it had no get up and go unless it was already rolling. Are you looking for an auto or a manual transmission?
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Unread 12-31-2012, 01:35 PM   #8
Jeep4L1fe
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I don't feel bogged down. With the stock 3.21s...it had no get up and go unless it was already rolling. Are you looking for an auto or a manual transmission?
That's good to hear! I'm leaning towards stick at the moment...
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Unread 12-31-2012, 01:39 PM   #9
Walle
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Cool! This is the reason I was asking...I stole this from the FAQs.



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Unread 12-31-2012, 01:42 PM   #10
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With a proper regear, your performance may improve.
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Unread 01-01-2013, 08:15 AM   #11
HappyTrails
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Quote:
Originally Posted by Jeep4L1fe View Post
I'd consider a regear, but the S/C is expensive.
Yes, but the S/C is a lot more FUN!

I did the S/C and regeared to 5.38's. So, it is now a lot more FUN++
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Unread 01-01-2013, 08:29 AM   #12
Brightwhite
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I have a '12 Sahara and had 3:21 gears in it while running 2.5" and 33" tires. Ran it like that for about 5k miles. I live in colorado so mountain driving up and over passes was tough to even stay above 55mph with pout revving at 4-5000 rpms, the engine would heat up and I would have to let off. Driving I town was bearable. Offroading, forget it unless you are in 4low, zero power in 4hi.

I regeared to 4:88's and jumped to 35" tires. I did 4:88 because I do plan on 37's in about a year after new driveshafts, flat fenders, sleeve gusset, ect. I wanted to just do the regear once. My 4:88's run about 2700'ish at 75mph, but I really jump gears back and fourth - it takes a pretty big hill to do so. If it does jumpmill rev to 3500 rpms, which isn't bad. With the 3:21's I would go to 5000 rpms, felt like it was going down to 3rd or 4th gear, instead of 5th when I would hit a hill.

Regear to 4:10 or 4:56 if 35's is as big as you'll ever go, or go to 4:88's for 37's if that's in your plans.

Also, gas mileage on a 1600 mile trip from Denver to Texas over Xmas I averaged 15mpg. That was all highway, with a jeep loaded down with luggage, gifts, guns and ammo, you name it. I was pleasantly surprised it did that well.

Pics for you to see my '12 with 35's and many additions
image-1557450474.jpg   image-2119291152.jpg  
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Unread 01-01-2013, 08:34 AM   #13
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Quote:
Originally Posted by Walle View Post
Cool! This is the reason I was asking...I stole this from the FAQs.



This chart is for the 3.8 by the way. There is another one out there for the 3.6 that is night and day different. Just don't want the OP to get confused since he was asking about the 3.6 engine
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Unread 01-01-2013, 09:41 AM   #14
nwpipelayerxj
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Quote:
Originally Posted by Jeep4L1fe
I'd consider a regear, but the S/C is expensive.

Well I don't own a JK yet, but I'm considering getting one.
Both are expensive, the S/C comment was a "haha ya right" thing. Definitely regear!!!
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Unread 01-03-2013, 09:26 PM   #15
Chief602
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Like stated above, if you go with the 2012 and 4:10's i don't think you will find it necessary to re gear. I have a 3.6 with 4:10, automatic with 35's and I find it to have plenty of power on and off road. The lift and tires did kill the MPG's though.
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