Cons of regearing - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Wrangler Forums > JK Wrangler Technical Forum > Cons of regearing

Introducing MONSTALINER™ UV Permanent DIY Roll On Bed LineBill Baird Motorsports DIY parts - NalinMFG.comComponent speaker deal for your dash - NalinMFG

Reply
Unread 09-05-2012, 12:11 PM   #1
12Htownsahara
Registered User
2012 JK Wrangler 
 
Join Date: Jul 2012
Location: Magnolia, Tx
Posts: 32
Cons of regearing

I'm considering pulling the trigger on some gears 5.13 to be exact. Just wondering of there are any cons in regearing. I have a 2012 JKU auto tranny. Will my gas mileage Increase or decrease? I know they will help my engine run under less strain just curious about downfall of regearing if there is any. My JK is 90% highway for now. 3 months 6200 miles.

__________________
"Back up and Gas it"
12Htownsahara is offline   Reply With Quote
Unread 09-05-2012, 12:40 PM   #2
MudDuck99
Registered User
2014 JK Wrangler 
 
Join Date: Nov 2008
Location: Cleveland, TN, Cleveland,Tn
Posts: 2,141
With no lift or bigger wheels and/or tires, and and you driving 90% highway ; it really wouldn't make sense. It doesn't seem like it would be worth the money. 5.13s on the highway will definitely give you worse mpgs
MudDuck99 is offline   Reply With Quote
Unread 09-05-2012, 12:48 PM   #3
12Htownsahara
Registered User
2012 JK Wrangler 
 
Join Date: Jul 2012
Location: Magnolia, Tx
Posts: 32
Im sorry I have a 3.5 inch lift with some 35 inch Nitto trails
__________________
"Back up and Gas it"
12Htownsahara is offline   Reply With Quote
Unread 09-05-2012, 02:37 PM   #4
DrHolliday
Senior Member
 
DrHolliday's Avatar
2011 JK Wrangler 
 
Join Date: Oct 2011
Location: Gresham, OREGON
Posts: 679
Quote:
Originally Posted by 12Htownsahara
Im sorry I have a 3.5 inch lift with some 35 inch Nitto trails
4.10's are pretty good for the 2012 auto and 35's. 4.56 would be better. Anything higher would be too much gear imo.
__________________
2011 JK Rubicon 2 door 6-speed manual, 3.5" Rock Krawler Suspension lift, 1.25" Daystar body lift, 40x13.50R17 Nitto Mud Grapplers


My build thread
DrHolliday is offline   Reply With Quote
Unread 09-05-2012, 02:44 PM   #5
SubAtomicGenius
Sarcastic Fantastic
 
SubAtomicGenius's Avatar
2011 JK Wrangler 
 
Join Date: Jun 2011
Posts: 3,005
Cons of regearing to the right gear range? None. Regearing deeper than required? High RPMs on highway and loss of mileage.
SubAtomicGenius is offline   Reply With Quote
Unread 09-05-2012, 03:01 PM   #6
12Htownsahara
Registered User
2012 JK Wrangler 
 
Join Date: Jul 2012
Location: Magnolia, Tx
Posts: 32
So maybe 4.88s would be better. I don't wanna run over 3 grand doing 70-75. I just want to stop lugging my tranny and hunting for OD.
__________________
"Back up and Gas it"
12Htownsahara is offline   Reply With Quote
Unread 09-05-2012, 03:02 PM   #7
perryhooah
Registered User
2008 JK Wrangler 
 
Join Date: Apr 2009
Location: S'ville, SC
Posts: 240
yeah, like he said... you need to know where you wanna go before you do it, and if you install the correct ratio, you will be great, but if not, too low OR too high, things could suck pretty bad
__________________
2008 UNLIMITED
OIF ('03-'04) & OEF ('07-'08)('12-'13) Veteran
perryhooah is offline   Reply With Quote
Unread 09-05-2012, 03:28 PM   #8
Vince1
Registered User
2010 JK Wrangler 
 
Join Date: Sep 2010
Location: Rocky Mountain
Posts: 188
Few have ever regretted going 5.13 with 35's on an automatic.
Vince1 is offline   Reply With Quote
Unread 09-05-2012, 03:34 PM   #9
12Htownsahara
Registered User
2012 JK Wrangler 
 
Join Date: Jul 2012
Location: Magnolia, Tx
Posts: 32
Like I said I drive mine on the hwy everyday. 2000 miles a month. I want to regain my stock power and and stop OD hunting.
__________________
"Back up and Gas it"
12Htownsahara is offline   Reply With Quote
Unread 09-05-2012, 04:07 PM   #10
DrHolliday
Senior Member
 
DrHolliday's Avatar
2011 JK Wrangler 
 
Join Date: Oct 2011
Location: Gresham, OREGON
Posts: 679
Quote:
Originally Posted by Vince1 View Post
Few have ever regretted going 5.13 with 35's on an automatic.
On 07-11 correct, the 2012 has completely different gearing. Its more like the 07-11 manuals as far as over drive is concerned.
__________________
2011 JK Rubicon 2 door 6-speed manual, 3.5" Rock Krawler Suspension lift, 1.25" Daystar body lift, 40x13.50R17 Nitto Mud Grapplers


My build thread
DrHolliday is offline   Reply With Quote
Unread 09-05-2012, 04:13 PM   #11
Spank
Registered User
2012 JK Wrangler 
 
Join Date: Jul 2007
Location: Colorado
Posts: 996
4.56 seems to be the sweet spot on the 2012+ models with 35's.
__________________
'12 Wrangler Unlimited Rubicon
Spank is online now   Reply With Quote
Unread 09-05-2012, 05:08 PM   #12
gwar11d2
Registered User
2009 JK Wrangler 
 
Join Date: Oct 2006
Location: Mebane, NC
Posts: 807
Looks like 4:1 or 4:56 would put you in a nice spot. The 5:13's you posted first would be good for 2007-2011, but you have a 2012 so here is what the gear chart says. These are RPM's at 70MPH, Green - Good balance, Yellow - Sluggish or flat roads - Blue - rock crawling, a lot of towing, etc

__________________
09 JK Jeep Green Sahara Unlimited / Teraflex 2.5" Spring-Shocks / 35's x 16" Level 8 Trackers/ Aussie Locker Front / 5:13's
My Build Thread:
http://www.jeepforum.com/forum/f96/w...hread-1231661/
gwar11d2 is offline   Reply With Quote
Unread 09-05-2012, 08:26 PM   #13
cdj588
Registered User
 
Join Date: Feb 2012
Location: Ft. Worth, TX
Posts: 32
When I drove the 2012 4door with the 255/75/17 wheels and 5 spd auto and the 3.73's the rpms were right at 3000 at 70. Seems like this chart is wrong or Im missing some information cause 255/75/17 is a 32inch overall wheel
cdj588 is offline   Reply With Quote
Unread 09-05-2012, 09:25 PM   #14
Brightwhite
Registered User
2012 JK Wrangler 
 
Join Date: Jun 2012
Location: Lakewood, CO
Posts: 128
From all of the research i have done I am torn between 4:56 and 4:88 on my '12 auto. The 4:56's seem to be plenty for even up to 37's (the largest I could ever see going). That's what I am leaning towards.

I drive like you. To and from the airport every week and around town. Then the occasional weekend run up to the mountains.
Brightwhite is offline   Reply With Quote
Unread 09-05-2012, 10:00 PM   #15
tjkj2002
Registered User
2002 KJ Liberty 
 
Join Date: Dec 2009
Location: Colorado
Posts: 7,969
Quote:
Originally Posted by Brightwhite View Post
From all of the research i have done I am torn between 4:56 and 4:88 on my '12 auto. The 4:56's seem to be plenty for even up to 37's (the largest I could ever see going). That's what I am leaning towards.

I drive like you. To and from the airport every week and around town. Then the occasional weekend run up to the mountains.
Going the next lower gear set will help for city driving and let's face it driving a Jeep on 35"+ tires at 75mph+ can be scary and sometimes unsafe.Plus going one set lower will help overcome the added weight of the tires and any armor while just going back to the "stock zone" you still have mpg and performance loss due to the added weight but drastically better then the stock gears ratio with the big tires.Higher engine rpm's does not mean less mpg's or reduced engine life.


When I was researching what gear ratio to regear to everything said 4.88's would get me back in the stock range so I went with 5.13's since I do alot more city driving.After all was said and done I wished I went with 5.38's.
__________________
'02 Liberty sitting on 35" tires,HP44,RockJock60,and AtlasII t-case
tjkj2002 is offline   Reply With Quote




Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.