Diff Ratios For Standard vs Auto Trans - JeepForum.com
LinkBack Thread Tools
post #1 of 6 Old 10-13-2017, 12:34 AM Thread Starter
Registered User
1998 ZJ 
Join Date: Jan 2010
Location: charlotte, nc
Posts: 96
Diff Ratios For Standard vs Auto Trans

Thinking about swapping my ZJ for a new JK Rubicon. Noticed on the build sheets that the standard trans comes with 4.10 axles while an auto trans comes standard with 3.73 - even with the tow package. Is there a reason for this other than to make more money charging you an additional $700 to go back and add 4.10 axles?

14 JK Unlimited Rubicon
98 (ZJ) Grand Cherokee, 3" lift, LED lights, diff locks, Ford rear
tj2kj is offline  
Sponsored Links
post #2 of 6 Old 10-13-2017, 05:42 AM
Registered User
Join Date: Dec 2016
Posts: 38
No reason and it makes no sense considering the standard trans has a lower 1st gear

Sent from my SM-G930V using Tapatalk
OutcastJeeps is offline  
post #3 of 6 Old 10-13-2017, 08:49 AM
Web Wheeler
222Doc's Avatar
2012 JK Wrangler 
Join Date: Sep 2011
Location: Lake Havasu City
Posts: 7,315
It is do to the w5 auto is a beast compared to the stick(6speed is low end trans that has like 300ftlbs input max<W580 has over 427ftlbs). with the option of 4.10 and that auto it rolls 35s. My 2 door does rather well even on37s. You wont do that with the stick. remember a auto gear splits are at locked converter and when unlocked its multiplying torque.

If they ran it with 4.1 on 32s it would be over geared, loose mpg. 700$ is a rip though since its not like they have do much. when i ordered my jkr in 11 it was one of the first 12s 4.1 option i paid 50$. best 50$ i spent on the heep. well maybe the PSC steering is but stock anyaway.

If you get the auto rubi get the 4.1 before you check the box heated seats, leather or anything else.

Home of the Parker Desert Splash

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
222Doc is offline  
post #4 of 6 Old 10-13-2017, 11:17 AM
Registered User
2014 JK Wrangler 
Join Date: Jun 2013
Location: Glenpool
Posts: 214
IMO if you're going with 35s or larger don't spend the money for factory gears, wait and get the correct gears once you add the larger tires.

His- 2014 JKUR Copperhead Pearl
Hers- 2018 JK Gobi
Retired: 2016 JKWW
Retired: 2013 JK
BlueBabySound is offline  
post #5 of 6 Old 10-13-2017, 02:13 PM
Registered User
2016 JK Wrangler 
Join Date: Sep 2016
Posts: 551
Like Doc said, it has to do with the transmission. The auto is much sturdier than the stick. Having said that, if you're buying a Rubicon, my guess is that you are looking for many of the off road upgrades that come on a Rubi. If so, I would suggest that you opt for the 4.10 gears anyway, even with an auto trans. You may spend a little more for those gears now, but it will be alot cheaper than paying to do it later.

2016 Wrangler Unlimited
2.5" Teraflex Lift
305/70-17 Toyo Open Country AT2
Fuel Lethal Wheels
Bill123 is offline  
post #6 of 6 Old 10-13-2017, 02:34 PM
2012 JK Wrangler 
Join Date: Nov 2015
Location: Durham
Posts: 2,081
4.10's and an Auto will turn 35's just fine.

Don't mess around with a lesser gear ratio if you plan on any off roading with larger than stock tires.

06 KJ
12 JK,2.5" Teraflex lift,Bilstein 5100's,BFG KO2's P305/65R17
17 WK2 Trailhawk
cranbiz is offline  

Quick Reply

Register Now

In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.

Email Address:


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.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page

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 On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome