Recommend changing GEARS for 35" Tires? - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > JK Jeep Wrangler Forum > JK General Discussion Forum

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 09-30-2011, 01:12 PM   #1
Jeeper
 
CaptFireball's Avatar
 
Join Date: Aug 2011
Posts: 54
Images: 9
Recommend changing GEARS for 35" Tires?

To keep the vehicle's RPM somewhat at an acceptable level (between Highway Driving/Good Fuel Economy & Towing Power/Poor Fuel Economy) does anyone recommend changing your gears when you upgrade to 35" tires?

My Jeep is a 2012 JKU Rubicon with Auto Transmission. I have the 4.11 Gear Ratio. I'm putting a 4.5" Lift with 35" tires on soon and was thinking about changing the gears to 4.56. Vehicle used for both for DD and Off-Road.

I have heard the 4.56 gears are not really available for my Jeep and if you are going to change gears, you would want wait till you have 37" tires and install 4.88 gears. My Jeep would no longer fit into the garage with a 4.5" lift and 37" tires.

Comments?

CaptFireball is offline   Quote Quick Reply
Old 09-30-2011, 01:14 PM   #2
yeah,,,, im that good

5-Year WF Supporting Member
 
panthermark's Avatar
 
Join Date: Aug 2011
Location: Chicago-land
Posts: 9,875
Images: 13
If you have a 2012 with 4.10's and an auto, you don't have to change anything for 35's....which is good...because right now you can't change anything or you will go into limp mode.

panthermark is offline   Quote Quick Reply
Old 09-30-2011, 01:16 PM   #3
Jeeper
 
2012-Rubicon's Avatar
 
Join Date: Aug 2011
Location: New England
Posts: 1,891
You also don't need 4.5" for 35's.
2012-Rubicon is offline   Quote Quick Reply
Old 09-30-2011, 01:18 PM   #4
The Bad Guy

WF Supporting Member
 
daggo66's Avatar
 
Join Date: May 2009
Location: NJ exile living in Baltimore
Posts: 22,295
You may want to re-think that 4.5" lift however. Fatal Angle Tom Woods JK Wrangler Driveshafts - Jp Magazine
__________________
Tom

"I've got two things in this world, my balls and my word and I don't break them for no one."
daggo66 is offline   Quote Quick Reply
Old 09-30-2011, 02:57 PM   #5
Jeeper
 
CaptFireball's Avatar
 
Join Date: Aug 2011
Posts: 54
Images: 9
Yuuup. Just got off the phone with BDS-Suspension. I don't need the 4.5" lift for 35" tires. The 3" lift kit will work with 35" tires and I won't need to replace the driveshafts. As far as gears, seems the stock 4.11 will be okay for now.
CaptFireball is offline   Quote Quick Reply
Old 09-30-2011, 03:00 PM   #6
ESP
Jeeper
 
ESP's Avatar
 
Join Date: Jun 2010
Location: NC
Posts: 11,513
Quote:
Originally Posted by CaptFireball View Post
Yuuup. Just got off the phone with BDS-Suspension. I don't need the 4.5" lift for 35" tires. The 3" lift kit will work with 35" tires and I won't need to replace the driveshafts. As far as gears, seems the stock 4.11 will be okay for now.
You can run 35s with a 2.5 kit. Many do.
__________________
98 XJ 02 TJ 10 JK 13 JK

2013 JK - Lifted w/ 35s - Bilstein 5100s - Monster TB - Chopped Flares - Can't Keep It Clean
ESP is offline   Quote Quick Reply
Old 09-30-2011, 03:22 PM   #7
Jeeper
 
Join Date: Mar 2011
Posts: 85
I run 35s with 2.5" lift and they fit fine.
MD_Jeep is offline   Quote Quick Reply
Old 09-30-2011, 03:25 PM   #8
The Bad Guy

WF Supporting Member
 
daggo66's Avatar
 
Join Date: May 2009
Location: NJ exile living in Baltimore
Posts: 22,295
Quote:
Originally Posted by CaptFireball View Post
Yuuup. Just got off the phone with BDS-Suspension. I don't need the 4.5" lift for 35" tires. The 3" lift kit will work with 35" tires and I won't need to replace the driveshafts. As far as gears, seems the stock 4.11 will be okay for now.
__________________
Tom

"I've got two things in this world, my balls and my word and I don't break them for no one."
daggo66 is offline   Quote Quick Reply
Old 09-30-2011, 03:41 PM   #9
Jeeper
 
roxbury29's Avatar
 
Join Date: Aug 2010
Location: Schererville / Indiana
Posts: 923
This AEV 2012 Wrangler has a 3.5" lift. Rides like a dream.
35" tires
Auto 4.10 - a friend of a friend just purchased this one, it has 35's and 4.10 Auto - As far as power, when I drove it, it felt like my 2011 with 3.73 and stock 32's... ( I will likely need 4.88, if I go to 33's )

I know AEV is working on a 2.5" lift that will clear 35's as well..

good luck!!!
roxbury29 is offline   Quote Quick Reply
Old 09-30-2011, 03:49 PM   #10
..shall not be infringed!

WF Supporting Member
 
Up Hill Bill's Avatar
 
Join Date: Jun 2011
Location: Up the hill, CA Northcoast
Posts: 4,638
Dave Harriton, founder of AEV, posted this on another forum:


Quote:
Originally Posted by AEV Dave:

Here we go. It doesn't matter how much more power the 3.6 has, it has to do with the trans ratios. Even the 5.7 and 6.1s needed 4.88s with 35s because of the tall ratios of the 545.

The A580 auto is geared lower throughout its range. What’s this mean? It means that 4.10s with the A580 is equivalent to 4.88 with the 42RLE. So 4.10 is ideal for 35s.

I'm pretty sure I'm the only person on this board who has driven a 3.6 A580 with 35s and 4.10.
The 3.6 does not require the same ratios as the 07-10 JKs, which is good because the pinion gears are that much stronger. 4.88 would be fine for 37s.
__________________
2012 JKU Rubicon
Sahara Tan
Auto
3.73


Up Hill Bill
Up Hill Bill is offline   Quote Quick Reply
Old 09-30-2011, 04:09 PM   #11
Jeeper
 
Join Date: Mar 2011
Posts: 85
If I ever regear I am going with 4.88s
MD_Jeep is offline   Quote Quick Reply
Old 09-30-2011, 04:46 PM   #12
Jeeper
 
roxbury29's Avatar
 
Join Date: Aug 2010
Location: Schererville / Indiana
Posts: 923
Quote:
Originally Posted by Up Hill Bill View Post
Dave Harriton, founder of AEV, posted this on another forum:
That makes sense.. the one I drove AEV built and changed the sport gear to 4.10 with 35'S
It is definitly slower with the 35's..
But still felt pretty good, and was fun to drive..
roxbury29 is offline   Quote Quick Reply
Old 09-30-2011, 10:08 PM   #13
Jeeper
 
NHRubi's Avatar
 
Join Date: Sep 2011
Location: Seacoast NH
Posts: 73
Quote:
Originally Posted by CaptFireball View Post
Yuuup. Just got off the phone with BDS-Suspension. I don't need the 4.5" lift for 35" tires. The 3" lift kit will work with 35" tires and I won't need to replace the driveshafts. As far as gears, seems the stock 4.11 will be okay for now.
Stock 4.11? Care to elaborate?
__________________
Greg (2012 Wrangler Rubicon - Deep Cherry Red/Black, Auto, HT, 4.10s, Supp Air Bags)
Built Oct 11, Delivered 28 Oct 11
Jeep #5 (86 GW, 97 TJ, 02 TJ, 95 YJ) - gone but not forgotten
NHRubi is offline   Quote Quick Reply
Old 09-30-2011, 10:13 PM   #14
Rock-Rubber

WF Supporting Member
 
GoldenSahara00's Avatar
 
Join Date: Aug 2010
Location: SCPA
Posts: 16,744
Quote:
Originally Posted by NHRubi View Post
Stock 4.11? Care to elaborate?
He's got one up duh.
__________________
Ryan - A good eye, a light foot, and a smart rig.
Bolt-ons are boring
AMERICAN JEEPER
My Build - http://www.wranglerforum.com/f118/pr...a00-74622.html
Rausch Creek Trip: 2014 Trip Coming Soon
GoldenSahara00 is offline   Quote Quick Reply
Old 09-30-2011, 10:40 PM   #15
Jeeper
 
rics1997's Avatar
 
Join Date: Oct 2010
Location: Bristol, Tn
Posts: 4,764
Well, the 4.88 with 35 will be ok but just ok on older models. So AEV saying 4.10 with new motor will be like older models with 4.88 may be ok but not great. Most will tell you on here that 5.13 or 5.37 is actually were it should be to maximize power which means the new one should be closer to 4.88 to get full power back. Will 4.10 be ok, yes but then again it's just ok. It will not be idea just ok. But then again, ok is a lot less expensive then the true idea of 4.88 and 35's. 4.88 with the 42RLE is idea for 33's an barely idea then but not 35's
__________________
2010 Dark Charcoal Pearl Jeep Wrangler Sport S Automatic
4.88 Yukon w/Trac-Lok rear and Eaton ELocker Front - Synergy Gussets - B&M 70264 Trans Cooler
BDS 3" lift - BDS Fox 2.0 Racing Shocks
XHD front Bumper - Trektop NX - Goodyear MT/R w/Kevlar 35X12.5X15 on MB Chaos 5 Wheels - Thrush Turbo Muffler

Become a WranglerForum Supporting Member!
rics1997 is offline   Quote Quick Reply
Old 09-30-2011, 10:42 PM   #16
Jeeper
 
rics1997's Avatar
 
Join Date: Oct 2010
Location: Bristol, Tn
Posts: 4,764
On the 2012, not sure that fatal angle is as much as an issue as the new exhaust being in the way of any lift
__________________
2010 Dark Charcoal Pearl Jeep Wrangler Sport S Automatic
4.88 Yukon w/Trac-Lok rear and Eaton ELocker Front - Synergy Gussets - B&M 70264 Trans Cooler
BDS 3" lift - BDS Fox 2.0 Racing Shocks
XHD front Bumper - Trektop NX - Goodyear MT/R w/Kevlar 35X12.5X15 on MB Chaos 5 Wheels - Thrush Turbo Muffler

Become a WranglerForum Supporting Member!
rics1997 is offline   Quote Quick Reply
Old 09-30-2011, 10:56 PM   #17
Rock-Rubber

WF Supporting Member
 
GoldenSahara00's Avatar
 
Join Date: Aug 2010
Location: SCPA
Posts: 16,744
Either way he can't regear it. For now it will be fine. I wouldn't regear it personally.
__________________
Ryan - A good eye, a light foot, and a smart rig.
Bolt-ons are boring
AMERICAN JEEPER
My Build - http://www.wranglerforum.com/f118/pr...a00-74622.html
Rausch Creek Trip: 2014 Trip Coming Soon
GoldenSahara00 is offline   Quote Quick Reply
Old 09-30-2011, 10:58 PM   #18
The Bad Guy

WF Supporting Member
 
daggo66's Avatar
 
Join Date: May 2009
Location: NJ exile living in Baltimore
Posts: 22,295
Quote:
Originally Posted by rics1997
On the 2012, not sure that fatal angle is as much as an issue as the new exhaust being in the way of any lift
Same cv drive shaft boots.
__________________
Tom

"I've got two things in this world, my balls and my word and I don't break them for no one."
daggo66 is offline   Quote Quick Reply
Old 09-30-2011, 11:21 PM   #19
Jeeper
 
Join Date: Aug 2011
Posts: 15
what about a 2012 manual with 3.73 and 35s. Should I regear? What size is ideal? 80% DD, 20% off road
jay997s is offline   Quote Quick Reply
Old 09-30-2011, 11:26 PM   #20
yeah,,,, im that good

5-Year WF Supporting Member
 
panthermark's Avatar
 
Join Date: Aug 2011
Location: Chicago-land
Posts: 9,875
Images: 13
Quote:
Originally Posted by NHRubi View Post
Stock 4.11? Care to elaborate?
It is custom made...
Most go to 10...this goes to 11.....
panthermark is offline   Quote Quick Reply
Old 09-30-2011, 11:28 PM   #21
..shall not be infringed!

WF Supporting Member
 
Up Hill Bill's Avatar
 
Join Date: Jun 2011
Location: Up the hill, CA Northcoast
Posts: 4,638
Quote:
Originally Posted by panthermark View Post
It is custom made...
Most go to 10...this goes to 11.....
A whole dang movie for one good line......
__________________
2012 JKU Rubicon
Sahara Tan
Auto
3.73


Up Hill Bill
Up Hill Bill is offline   Quote Quick Reply
Old 09-30-2011, 11:30 PM   #22
Jeeper
 
Join Date: Sep 2011
Posts: 134
Quote:
Originally Posted by daggo66 View Post
Same cv drive shaft boots.
Doesnt hit in the same spot. 2012 is more about damaging the exhaust, than ripping the boot.
Nvrmor is offline   Quote Quick Reply
Old 09-30-2011, 11:41 PM   #23
Rock-Rubber

WF Supporting Member
 
GoldenSahara00's Avatar
 
Join Date: Aug 2010
Location: SCPA
Posts: 16,744
Quote:
Originally Posted by Nvrmor View Post
Doesnt hit in the same spot. 2012 is more about damaging the exhaust, than ripping the boot.
itll still rip at the same height. I think he said he was gona rerun the exhaust. its still something to consider.

plus I wouldn't argue with Daggo, hes kind of a big deal...
__________________
Ryan - A good eye, a light foot, and a smart rig.
Bolt-ons are boring
AMERICAN JEEPER
My Build - http://www.wranglerforum.com/f118/pr...a00-74622.html
Rausch Creek Trip: 2014 Trip Coming Soon
GoldenSahara00 is offline   Quote Quick Reply
Old 09-30-2011, 11:43 PM   #24
Rock-Rubber

WF Supporting Member
 
GoldenSahara00's Avatar
 
Join Date: Aug 2010
Location: SCPA
Posts: 16,744
Quote:
Originally Posted by jay997s View Post
what about a 2012 manual with 3.73 and 35s. Should I regear? What size is ideal? 80% DD, 20% off road

I highly doubt its 20% offroad, that means for every 10k miles you put on, 2k are from offroad, and 8k on road.

I would regear, but once again you can't regear at the time being. So... does it matter? get the tires and then decide. just make sure you have the money to do it when you can. Oh and you can always put your stock tires back on if you hate them til the regear is available :P

Personally I would say it would be a bit slow but more managable with the standard.
__________________
Ryan - A good eye, a light foot, and a smart rig.
Bolt-ons are boring
AMERICAN JEEPER
My Build - http://www.wranglerforum.com/f118/pr...a00-74622.html
Rausch Creek Trip: 2014 Trip Coming Soon
GoldenSahara00 is offline   Quote Quick Reply
Old 09-30-2011, 11:55 PM   #25
Jeeper
 
Join Date: Sep 2011
Posts: 134
Quote:
Originally Posted by GoldenSahara00 View Post
itll still rip at the same height. I think he said he was gona rerun the exhaust. its still something to consider.
well it wont rip because of the tranny skid like previous years, but it will melt the boot and damage the exhaust at full droop.

Quote:
plus I wouldn't argue with Daggo, hes kind of a big deal...
Nvrmor is offline   Quote Quick Reply
Old 10-01-2011, 12:00 AM   #26
Rock-Rubber

WF Supporting Member
 
GoldenSahara00's Avatar
 
Join Date: Aug 2010
Location: SCPA
Posts: 16,744
Quote:
Originally Posted by Nvrmor View Post
well it wont rip because of the tranny skid like previous years, but it will melt the boot and damage the exhaust at full droop.




I've rubbed my front DS on my tranny skid before and I drive a TJ

anyways yeah, sucks for you jk people. at least it doesnt rip.
__________________
Ryan - A good eye, a light foot, and a smart rig.
Bolt-ons are boring
AMERICAN JEEPER
My Build - http://www.wranglerforum.com/f118/pr...a00-74622.html
Rausch Creek Trip: 2014 Trip Coming Soon
GoldenSahara00 is offline   Quote Quick Reply
Old 10-01-2011, 02:48 PM   #27
Jeeper
 
CaptFireball's Avatar
 
Join Date: Aug 2011
Posts: 54
Images: 9
Quote:
Originally Posted by NHRubi View Post
Stock 4.11? Care to elaborate?
Sorry folks, I stand corrected. My stock gears are 4.10.

BTW... What do you mean by "can't re-gear now anyway". Are you referring to the Jeep Warranty? I think I missed something?
CaptFireball is offline   Quote Quick Reply
Old 10-01-2011, 02:51 PM   #28
Jeeper
 
CaptFireball's Avatar
 
Join Date: Aug 2011
Posts: 54
Images: 9
Quote:
Originally Posted by GoldenSahara00 View Post
Either way he can't regear it. For now it will be fine. I wouldn't regear it personally.
Hello GoldenSahara00, Can you explain a little further regarding not being able to re-gear? Just trying to learn something here. Thx.
CaptFireball is offline   Quote Quick Reply
Old 10-01-2011, 03:02 PM   #29
Jeeper
 
C.L.'s Avatar
 
Join Date: Mar 2011
Location: North NJ
Posts: 2,108
Quote:
Originally Posted by CaptFireball View Post
Hello GoldenSahara00, Can you explain a little further regarding not being able to re-gear? Just trying to learn something here. Thx.
The A580 auto transmission freaks out when the wheels report that they are spinning at a different rate than what the transmission expects them to with the stock gear ratios.
C.L. is offline   Quote Quick Reply
Old 10-01-2011, 03:40 PM   #30
Jeeper
 
CaptFireball's Avatar
 
Join Date: Aug 2011
Posts: 54
Images: 9
Great! So are all 2012 JKU w/Auto Transmission owners doomed because you can't upgrade to larger tires?

Will one of those electronic tire/speedometer calibration devices fix any problems with the auto transmission (other than making the speedometer display the correct speed)?

Are we waiting for someone to "crack" the code on new 2012 Jeeps before we can get larger tires and re-gear?

Without keeping the stock tires and gears, how do you keep the Auto Transmission from freaking out on a new 2012 Jeep JKU when you put on larger tires? Do you have to re-gear so the RPMs stay about the same as stock tires?

CaptFireball is offline   Quote Quick Reply
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Jeep Wrangler Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools

Posting Rules
You may post new threads
You may 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


Similar Threads
Thread Thread Starter Forum Replies Last Post
tires vs gears (what will it feel like) formulas... Triple88a General Jeep Discussion 8 06-07-2011 11:20 PM
Recommend a Lift for: 35" tires, Mostly Highway Driving TheInterestHunter TJ General Discussion Forum 15 02-21-2011 07:24 PM
4.56 gears with 30" tires? netlohcs TJ General Discussion Forum 7 02-16-2011 12:09 AM
Changing Ring and Pinion Gears jeeps&comics YJ Tech Forum 9 07-07-2007 05:36 PM
Tires Axles And gears x4a6g6d3x TJ General Discussion Forum 7 07-10-2006 10:35 PM



Download our Mobile App

» Network Links
»Jeep Parts
» Featured Product

All times are GMT -5. The time now is 07:30 AM.



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