gearing and lift help - Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > JK Jeep Wrangler Forum > JK Tech Forum

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 04-01-2014, 08:58 PM   #1
Jeeper
 
Join Date: Feb 2014
Location: Detroit MI
Posts: 183
gearing and lift help

i have a 2014 jku polar, i want to get the rev 3.5 RS lift with 35's, I'm not very knowledgeable about re-geraing but from the research i did it seems it would be better if i regear to 4.56. could anyone help em out and shed some insight on this , i mostly drive highway and its my DD but i do take it up to some slightly challenging trails as well so what would be the ideal gear ratio for my lift and tires.

ee4516 is offline   Quote
Old 04-02-2014, 08:48 AM   #2
Jeeper
 
derf's Avatar
 
Join Date: Oct 2012
Location: Aurora, CO
Posts: 1,799
I run 4.56 gears on my JK with 35's. I think it's a pretty good balance. The Jeep does just fine on the highway but it's also not bad on the trails.

If you're more concerned with trying to get another 0.1 MPG you could go with 4.10's and still be alright on the trails. If you're more concerned with trail performance and aren't going to worry about the 0.1 MPG or less that you'll lose you could go with 4.88 gears.

If you plan on ever going to 37's you may want to consider going straight to 4.88's.

__________________
2012 JK - 3.6/NSG370/NP241/D30/D44 - Grimm Jeeper
1986 J10 - 401/700R4/NP208/D44HD/D60FF - Truck Norris

My gear ratio calculator
derf is offline   Quote
Old 04-02-2014, 12:56 PM   #3
Jeeper
 
Join Date: Feb 2014
Location: Detroit MI
Posts: 183
Quote:
Originally Posted by derf View Post
I run 4.56 gears on my JK with 35's. I think it's a pretty good balance. The Jeep does just fine on the highway but it's also not bad on the trails.

If you're more concerned with trying to get another 0.1 MPG you could go with 4.10's and still be alright on the trails. If you're more concerned with trail performance and aren't going to worry about the 0.1 MPG or less that you'll lose you could go with 4.88 gears.

If you plan on ever going to 37's you may want to consider going straight to 4.88's.
thanks !! 0.1 mpg won't make a difference, i just didn't want it to go from the 18-19 i get now to 13 lol, 37's is a bit overkill for me, 35's would be good enough for the trails i go to.
ee4516 is offline   Quote
Old 04-02-2014, 01:13 PM   #4
Jeeper
 
derf's Avatar
 
Join Date: Oct 2012
Location: Aurora, CO
Posts: 1,799
Quote:
Originally Posted by ee4516 View Post
thanks !! 0.1 mpg won't make a difference, i just didn't want it to go from the 18-19 i get now to 13 lol, 37's is a bit overkill for me, 35's would be good enough for the trails i go to.
Going to bigger tires always means an MPG drop. A lot more than a minor difference in gears. Sure, the shorter gears mean your RPMs are higher but the load on the engine is less so the fuel economy isn't impacted as much as you would think.
__________________
2012 JK - 3.6/NSG370/NP241/D30/D44 - Grimm Jeeper
1986 J10 - 401/700R4/NP208/D44HD/D60FF - Truck Norris

My gear ratio calculator
derf is offline   Quote
Old 04-03-2014, 12:36 AM   #5
Jeeper
 
spinlock's Avatar
 
Join Date: Sep 2013
Location: 37.9° N, 121.7° W
Posts: 5,585
Lift's above 2.5" create more stress on the suspension, steering and driveline which can eventually lead various parts to wear out prematurely.

If you are new to lift game, it's a good idea to start with a 2.5" from one of the quality vendors which will allow you to run 35s. If you can afford a 3.5" lift you can afford a high quality 2.5".

A 4.56 gear ratio will work fine with 35s but check the gear chart to make sure you will be happy with the highway cursing speed.
__________________
"Don't take life too seriously. You'll never get out alive."
B. B.
spinlock is offline   Quote
Old 04-04-2014, 12:11 AM   #6
Jeeper
 
Join Date: Feb 2014
Location: Detroit MI
Posts: 183
well I'm planning to send my jku to AEV and have them do a full package build, I'm looking at getting the jk250 package which comes with a 2.5 lift but can be upgraded to a 3.5 and thats where I'm having the most problems deciding
ee4516 is offline   Quote
Old 04-04-2014, 09:10 AM   #7
Jeeper
 
derf's Avatar
 
Join Date: Oct 2012
Location: Aurora, CO
Posts: 1,799
Quote:
Originally Posted by ee4516 View Post
well I'm planning to send my jku to AEV and have them do a full package build, I'm looking at getting the jk250 package which comes with a 2.5 lift but can be upgraded to a 3.5 and thats where I'm having the most problems deciding
I've been happy with the 2.5" lift in my 2dr with the 35's. It does have extended bump stops and it still rubs just a hair when I stuff a front tire into the fender at full flex. But it's not terrible.

But one of the things I like about the height combination is that I can get in and out of the Jeep without doing any weird contortions. I can throw a leg up into the cab and slide right in. And when I get out I just slide right out. Any taller and I'd have to actually climb in and out, and that would probably mean I'd have to run actual steps instead of just rock slider bars.
__________________
2012 JK - 3.6/NSG370/NP241/D30/D44 - Grimm Jeeper
1986 J10 - 401/700R4/NP208/D44HD/D60FF - Truck Norris

My gear ratio calculator
derf is offline   Quote
Old 04-04-2014, 09:32 PM   #8
Jeeper
 
MI JeepSkate's Avatar
 
Join Date: Feb 2013
Location: Dexter, MI
Posts: 269
4.56 might be over kill on 35's with the 3.6, give it a try before you re gear
__________________
Assistant manager at Discount Tire. Yukon 4.88's, Detroit locker rear, Ace C's, JCR daggar front, RK 2.5 MT, Fox 2.0's and an empty wallet
MI JeepSkate is offline   Quote
Old 04-04-2014, 10:10 PM   #9
Jeeper
 
Join Date: Aug 2010
Posts: 91
I went with 4.56 in my '12 six speed. I think it's perfect with 35's. Plenty of power and doesn't rev too bad on the highway. I had 3.21 which was drive able but not enjoyable.
UnJKlimited is offline   Quote
Old 04-04-2014, 10:15 PM   #10
Jeeper
 
numbah1's Avatar
 
Join Date: Aug 2013
Posts: 618
Quote:
Originally Posted by UnJKlimited View Post
I went with 4.56 in my '12 six speed. I think it's perfect with 35's. Plenty of power and doesn't rev too bad on the highway. I had 3.21 which was drive able but not enjoyable.
I run the same gear ratio on my 2012 and I hate it. Trying to save some dough for lockers front and rear when I do my regear.
numbah1 is offline   Quote
Old 05-08-2014, 09:18 AM   #11
Jeeper
 
bass4money's Avatar
 
Join Date: Apr 2014
Location: tucson
Posts: 99
im having same issue right now, 2014 6 speed 6cyl. 3.5 rubicon super flex 35" tires.
Loss of power from stock and gas mileage dropped about 4.5 mpg. not much power esp in 5th and 6th gears hard to get at 65mph. what gearing do you recommends?
__________________
2014 2dr. silver OSCAR MIKE EDITION. Manual transmission 6cyl..
Rubicon 3.5" super flex, 17x8.5 method rims and 35" BF Goodrich tires. Body Armor Gen II doors. Custom decals. ARB twin compressor, new Spod with gauge, D2 LED's.
bass4money is offline   Quote
Old 05-08-2014, 09:38 AM   #12
Jeeper
 
derf's Avatar
 
Join Date: Oct 2012
Location: Aurora, CO
Posts: 1,799
Quote:
Originally Posted by bass4money View Post
im having same issue right now, 2014 6 speed 6cyl. 3.5 rubicon super flex 35" tires.
Loss of power from stock and gas mileage dropped about 4.5 mpg. not much power esp in 5th and 6th gears hard to get at 65mph. what gearing do you recommends?
I have 4.56 gears to match my 35" tires (same engine and transmission as you) and they're great. I would highly recommend them.

__________________
2012 JK - 3.6/NSG370/NP241/D30/D44 - Grimm Jeeper
1986 J10 - 401/700R4/NP208/D44HD/D60FF - Truck Norris

My gear ratio calculator
derf is offline   Quote
Reply

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off




Download our Mobile App

» Featured Product

All times are GMT -5. The time now is 07:16 AM.


User Alert System provided by Advanced User Tagging v3.1.0 (Pro) - vBulletin Mods & Addons Copyright © 2015 DragonByte Technologies Ltd.

Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC