Question in upgrading gears ratio - JeepForum.com
 
LinkBack Thread Tools
post #1 of 13 Old 04-13-2013, 05:55 AM Thread Starter
Ansary
Registered User
1996 YJ Wrangler 
 
Join Date: Apr 2013
Location: Cairo
Posts: 2
Question in upgrading gears ratio

Hi Jeepers,

I have a YJ 95 6 cy 4.0L. I am in process of upgrading the gears ratio to 4.1 I ordered ring and pinion for both the front and rear deferential. The front ring and pinion are 41/10 and the rear is 37/9 the gear ratio will be 4.1 and 4.11111. Is the 0.11111 difference normal or it can cause a problem?

Ansary is offline  
Sponsored Links
Advertisement
 
post #2 of 13 Old 04-13-2013, 06:11 AM
1998zj
Registered User
1995 YJ Wrangler 
 
Join Date: Jul 2004
Location: Indiana
Posts: 1,849
It will be fine, all of the Jeeps out there running that ratio are like that.

"Our lady of blessed acceleration don't fail me now"
1998zj is offline  
post #3 of 13 Old 04-13-2013, 06:24 AM
Siva283
Registered User
1995 YJ Wrangler 
 
Join Date: May 2011
Location: Falling Waters
Posts: 3,742
Most 4wd vehicles are like that cause the size of the ring gear is a little different between the axles. Yoir good to go

Sent from my Galaxy S3 using JeepForum

1995 YJ. 2 inch BDS Spring lift. 1 inch shackle lift. 1.25 inch JKS Body Lift 33x12.5x15's. Engo 10,000 pound winch.

Quote:
Originally Posted by Magnum View Post
I gave the Jeep the required offering of $$, sweat, and blood, and everything works fine now. -- Jim
Quote:
Originally Posted by ldso View Post
. It started with a $200 axle, and a few thousand dollars later I was done :)
Quote:
Originally Posted by Luuca View Post
diagnose the real issue before you start going all Obama on it - spending mad cash you'll need for other important things.

Ask me how I know...
Quote:
Originally Posted by Overhead View Post
this is also my second set of RC springs this year. I'd rather spend the money again and get something that will last.
Siva283 is offline  
post #4 of 13 Old 04-13-2013, 08:44 AM
RockWoRM
LJ's do it longer
 
RockWoRM's Avatar
2005 LJ Wrangler 
 
Join Date: Mar 2006
Location: Fresno
Posts: 9,221
You're likely to have more than 0.11111" of difference between the front and rear tires just from wear.

'05 LJR, 6sp, RC long arm w/MC 6" coils, 5.13 D44's w/chromo shafts, MC fenders/sliders/body armor, 37x12.50 MTR's, Warn 9.5, RockHard swing out w/full spare. <><
RockWoRM is offline  
post #5 of 13 Old 04-13-2013, 09:12 AM
rykemc
Registered User
1988 YJ Wrangler 
 
Join Date: Jun 2011
Location: lubbock
Posts: 577
You will have to change the carrier as well sir.
rykemc is offline  
post #6 of 13 Old 04-13-2013, 12:50 PM Thread Starter
Ansary
Registered User
1996 YJ Wrangler 
 
Join Date: Apr 2013
Location: Cairo
Posts: 2
I can't understand why should I change the carrier?
Ansary is offline  
post #7 of 13 Old 04-13-2013, 12:53 PM
pete1991YJ
Registered User
1991 YJ Wrangler 
 
Join Date: Mar 2012
Location: Niagara Falls
Posts: 1,876
The difference between the front and rear ratios is normal, and it is nothing to worry about. If your old gears were less than 3.73 ratio then you will also need new carriers to match the new gears - they are a different size. Most Dana brand axles are designed this way, the change in carrier size occurs at 3.73 ratio.

***--- Wrecking Crew member ---***
"I've prolly been around longer than you think"
pete1991YJ is offline  
post #8 of 13 Old 04-13-2013, 12:57 PM
Anticanman
RIP one good jeeper
 
Anticanman's Avatar
1994 YJ Wrangler 
 
Join Date: Aug 2009
Location: Ripon
Posts: 20,368
The ring gears only fit a certain number of ratios and they change slightly in size. You'll notice a 4.88 pinion is tint just achieve that gear ratio. Because that's what it is. The ratio between the ring and pinion gears which transfers to torque to the wheels from the transmission which also has its settings called gears.

By the by, unless you're installing full carrier lockers, find a set of used axles and skip the expensive regearing process. Trust me. I've been there and done it. And sticking to the Dana 35 in the rear?

Luck Favours The Prepared
Anticanman is offline  
post #9 of 13 Old 04-13-2013, 12:59 PM
Anticanman
RIP one good jeeper
 
Anticanman's Avatar
1994 YJ Wrangler 
 
Join Date: Aug 2009
Location: Ripon
Posts: 20,368
Quote:
Originally Posted by pete1991YJ View Post
The difference between the front and rear ratios is normal, and it is nothing to worry about. If your old gears were less than 3.73 ratio then you will also need new carriers to match the new gears - they are a different size. Most Dana brand axles are designed this way, the change in carrier size occurs at 3.73 ratio.
Pete is right. The break between the Dana 30 and 35 is at different places though. You can go up to 3.54 on the 30 and up to 3.73 on the 35 before you need to swap carriers.

Luck Favours The Prepared
Anticanman is offline  
post #10 of 13 Old 04-13-2013, 01:15 PM
pete1991YJ
Registered User
1991 YJ Wrangler 
 
Join Date: Mar 2012
Location: Niagara Falls
Posts: 1,876
Quote:
Originally Posted by Anticanman View Post
Pete is right. The break between the Dana 30 and 35 is at different places though. You can go up to 3.54 on the 30 and up to 3.73 on the 35 before you need to swap carriers.
OOps my mistake, I thought thy were in the same place. There *is* a carrier size break though.

***--- Wrecking Crew member ---***
"I've prolly been around longer than you think"
pete1991YJ is offline  
post #11 of 13 Old 04-13-2013, 01:25 PM
rykemc
Registered User
1988 YJ Wrangler 
 
Join Date: Jun 2011
Location: lubbock
Posts: 577
Per his thread on wrangler forum he is running 3.07 gears thus the need for new carriers front and rear. I told him that over there as well.
rykemc is offline  
post #12 of 13 Old 04-13-2013, 01:28 PM
Anticanman
RIP one good jeeper
 
Anticanman's Avatar
1994 YJ Wrangler 
 
Join Date: Aug 2009
Location: Ripon
Posts: 20,368
Quote:
Originally Posted by rykemc View Post
Per his thread on wrangler forum he is running 3.07 gears thus the need for new carriers front and rear. I told him that over there as well.
A very sincere kudos for following up.

Luck Favours The Prepared
Anticanman is offline  
post #13 of 13 Old 04-13-2013, 01:44 PM
rykemc
Registered User
1988 YJ Wrangler 
 
Join Date: Jun 2011
Location: lubbock
Posts: 577
Quote:
Originally Posted by Anticanman View Post
A very sincere kudos for following up.
Lord knows I have made enough mistakes with my own jeep, hate to see anyone else doing the same. And thank you sir.
rykemc is offline  
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.



Email Address:
OR

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.




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