Gear ratios - 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 > General Technical Discussions > Engines & Drivetrain > Gear ratios

XJ Rail Sale!The Ruffstuff NOT Universal 4 Link Kit!Vanco Big Brake Kit Promotion!

Reply
Unread 05-29-2012, 12:28 PM   #1
Joenate
Registered User
 
Join Date: May 2012
Location: Poolville, Texas
Posts: 7
Gear ratios

Ok this mite be a ignorant question but, in regards to regearing my 02 tj.
The gear ratios are going to be different from front to rear? ie 4.56 to 4.66 ?

Joenate is offline   Reply With Quote Quick reply to this message
Unread 05-29-2012, 03:07 PM   #2
scubamc
Registered User
1991 YJ Wrangler 
 
Join Date: Sep 2008
Location: USA
Posts: 1,399
That will probably cause a problem.
__________________
Horsepower is like a hot girl with STDs. You know you want to hit it but you're afraid of the consequences.
scubamc is offline   Reply With Quote Quick reply to this message
Unread 05-29-2012, 05:17 PM   #3
SquidsYJ
Registered User
1993 YJ Wrangler 
 
Join Date: Jul 2011
Location: Norfolk, Virginia
Posts: 175
Joenate: You want your ratios in your front and rear differentials to match. Sometimes they are off by 0.01 and that is apparently OK. For example, 4.56 front and 4.66 rear is bad, but a 4.10 front and a 4.11 rear is acceptable.
SquidsYJ is offline   Reply With Quote Quick reply to this message
Unread 05-29-2012, 08:02 PM   #4
Jason
Registered User
2005 TJ Wrangler 
 
Join Date: May 2009
Location: Eaton Rapids, Michigan
Posts: 6,452
Quote:
Originally Posted by SquidsYJ View Post
Joenate: You want your ratios in your front and rear differentials to match. Sometimes they are off by 0.01 and that is apparently OK. For example, 4.56 front and 4.66 rear is bad, but a 4.10 front and a 4.11 rear is acceptable.
This is correct.

The reason the exact mathematical ratio can differ is due to the tooth count of the gears in the differentials. You may find a slight difference (one or two HUNDREDTHS) in the actual ratio. For example. I technically have 4.55555555555~ gears in my front axle (41 tooth ring gear and 9 tooth pinion gear) and 4.5454545~ in my rear (50 tooth ring and 11 tooth pinion). These round to 4.56 and 4.55 respectively, and would be commonly referred to as 4.56s. You might hear them referred to as 4.55s. "4.10s" could actually be 4.09, 4.10 or 4.11. This small difference doesn't matter; mixing ratios like 3.07 and 4.10 will be an expensive disaster.
Jason is offline   Reply With Quote Quick reply to this message
Unread 05-30-2012, 06:40 AM   #5
Joenate
Registered User
 
Join Date: May 2012
Location: Poolville, Texas
Posts: 7
Thank you for that information.
Joenate is offline   Reply With Quote Quick reply to this message
Reply

Quick Reply
Message:
Options

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:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.
Note: All free e-mails have been banned due to mis-use. (Yahoo, Gmail, Hotmail, etc.)
Don't have a non-free e-mail address? Click here for a solution: Manual Account Creation
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






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.