Something new to think about - Jeep Wrangler Forum
Jeep Wrangler Forum

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

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 10-03-2013, 02:31 AM   #1
Jeeper
 
Join Date: Jul 2012
Location: California
Posts: 60
Something new to think about

so im sorry if some of you dont approve but here is what im planning on doing....maybe.

i have a 2.5L tj manual. i want to regear the rear axle to 4.56 or 4.88. with 33's on it. and keep the front stock gears and put on some 31's.

Ok so i probably wont do this, i just want to hear your thoughts

__________________
I'd rather push a Jeep than drive a Chevy
oaky1717 is offline   Quote Quick Reply
Old 10-03-2013, 02:47 AM   #2
Jeeper
 
Slater451's Avatar
 
Join Date: Oct 2012
Location: Syracuse NY
Posts: 889
1st? Why two different tires sizes... It will drive incredibly terrible....
2nd. You won't be able to use 4 wheel drive because of the different gear ratios.

Slater451 is offline   Quote Quick Reply
Old 10-03-2013, 08:10 AM   #3
Jeeper
 
TrailbossNJ's Avatar
 
Join Date: Apr 2011
Location: In a house...
Posts: 615
If you want a race car, why not buy one instead of ruining a decent Jeep? lol
__________________
An educated, armed populace cannot be enslaved.
TrailbossNJ is offline   Quote Quick Reply
Old 10-03-2013, 09:10 AM   #4
Jeeper
 
s14sh3r's Avatar
 
Join Date: Sep 2011
Location: Clayton, OK
Posts: 2,049
It can be done, as long as you keep the effective gear ratio the same front/rear.

Your 2.5 should have come with 4.10 gears and 29 (approx) inch tires.
I messed around with a gear ratio calculator to see what combinations would work with 4:56 or 4:88 gears in the rear and 4:10 in the front. The closest I could come up with has you running stock 29 inch tires on the front and rear tires with a 34.5 inch diameter and 4:88 gears in the back.

Here's the calculator I used: 4Lo.com :: Tire Size Change, New Gear Ratio Calculator
s14sh3r is offline   Quote Quick Reply
Old 10-03-2013, 11:22 PM   #5
Jeeper
 
Join Date: Jul 2012
Location: California
Posts: 60
i wouldnt be using 4 wheel drive i just saw a vw baja bug with 31x10.50x15 in the front and 33x12.50x15 in the back and it looked pretty awesome. im never really going to do this i just wanted to know if it could be done.

and unfortunatly the stock tires on a 2001 tj SE is 27.5 ish tires
__________________
I'd rather push a Jeep than drive a Chevy
oaky1717 is offline   Quote Quick Reply
Old 10-03-2013, 11:24 PM   #6
Jeeper
 
Join Date: Jul 2012
Location: California
Posts: 60
Quote:
Originally Posted by Slater451 View Post
1st? Why two different tires sizes... It will drive incredibly terrible....
2nd. You won't be able to use 4 wheel drive because of the different gear ratios.
why would it drive terribly ?
__________________
I'd rather push a Jeep than drive a Chevy
oaky1717 is offline   Quote Quick Reply
Old 10-04-2013, 11:15 AM   #7
Jeeper
 
sparky's Avatar
 
Join Date: Oct 2009
Location: Phila
Posts: 1,942
It will drive bad because a Jeep's suspension is setup to have the same size tires front and rear. Other vehicles can be built to handle properly with front and rear mismatched. None of them are four wheel drive. They are always rear wheel drive.
sparky is offline   Quote Quick Reply
Old 10-04-2013, 01:52 PM   #8
Jeeper
 
Raspy's Avatar
 
Join Date: Dec 2012
Location: Northern Nevada
Posts: 120
It's weird, but I don't see why it would handle poorly. Sparky and Slater 451 need to be more specific with their comments.

You have a part time 4wd system anyway, so a slight difference in effective ratios is no big deal in the snow. But you would be better off if the front wheels were affectively trying to travel faster then the rears, I think.

Remember, in our Jeeps the front wheels always travel farther than the rears as you drive, or for that matter, in any four wheeled vehicle. But the Jeep front and rear ratio is the same. This difference is always there unless the car is running absolutely straight. There is no compensation for this in a 4WD system with no center differential.

My buddy had two different ratios in an old Ford pickup where someone had changed the front or rear axle at some point. It worked OK.
__________________
2013 Rubi

"I only exaggerate enough to compensate for being taken with a grain of salt."
Raspy is offline   Quote Quick Reply
Old 10-04-2013, 01:55 PM   #9
Jeeper
 
whetstone's Avatar
 
Join Date: Aug 2012
Posts: 2,326
Remember, in our Jeeps the front wheels always travel farther than the rears as you drive, or for that matter, in any four wheeled vehicle. But the Jeep front and rear ratio is the same. This difference is always there unless the car is running absolutely straight. There is no compensation for this in a 4WD system with no center differential.


How did you come to this conclusion?
__________________
As it turns out, I'm not a 'real' jeeper
whetstone is offline   Quote Quick Reply
Old 10-04-2013, 02:30 PM   #10
Jeeper
 
Raspy's Avatar
 
Join Date: Dec 2012
Location: Northern Nevada
Posts: 120
whetstone,

Whenever a vehicle makes a turn, the front wheels make a wider arc than the back wheels. The wider arc is a longer path. This is why we Wranglers should not run in 4WD on hard surfaces. The front and rear wheels travel a different distance in curves so there must be slipping somewhere if we are in 4WD.

Now, there really is no such thing as driving straight. We always are making small corrections to a more or less straight path. So, the front wheels are always traveling farther than the rears are unless we are actually driving absolutely straight.

No ratio difference, between the front and rear diffs, will correct this problem because it's variable. But a center differential will compensate for it.

On slippery surfaces we don't notice this happening, but it is, and so if there was a different ratio in the front and rear, and different size tires that made the difference small, we wouldn't notice it.

Don't you agree?
__________________
2013 Rubi

"I only exaggerate enough to compensate for being taken with a grain of salt."
Raspy is offline   Quote Quick Reply
Old 10-04-2013, 04:05 PM   #11
Jeeper
 
whetstone's Avatar
 
Join Date: Aug 2012
Posts: 2,326
Quote:
Originally Posted by Raspy View Post
whetstone,
Don't you agree?
Yes, I do. The first time I read it I just skimmed quickly on my phone and misunderstood what you were saying.
__________________
As it turns out, I'm not a 'real' jeeper
whetstone is offline   Quote Quick Reply
Old 10-05-2013, 01:51 AM   #12
Jeeper
 
Join Date: Jul 2012
Location: California
Posts: 60
Quote:
Originally Posted by Raspy View Post
whetstone,

Whenever a vehicle makes a turn, the front wheels make a wider arc than the back wheels. The wider arc is a longer path. This is why we Wranglers should not run in 4WD on hard surfaces. The front and rear wheels travel a different distance in curves so there must be slipping somewhere if we are in 4WD.

Now, there really is no such thing as driving straight. We always are making small corrections to a more or less straight path. So, the front wheels are always traveling farther than the rears are unless we are actually driving absolutely straight.

No ratio difference, between the front and rear diffs, will correct this problem because it's variable. But a center differential will compensate for it.

On slippery surfaces we don't notice this happening, but it is, and so if there was a different ratio in the front and rear, and different size tires that made the difference small, we wouldn't notice it.

Don't you agree?
mind = blown

thanks for the input. much appreciated

__________________
I'd rather push a Jeep than drive a Chevy
oaky1717 is offline   Quote Quick Reply
Reply

Tags
axle , regearing , tire size

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




Download our Mobile App

» Network Links
»Jeep Parts
» Featured Product

All times are GMT -5. The time now is 03:20 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