Transmission/Gear question from new jeep owner - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ 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 08-31-2010, 11:34 AM   #1
Jeeper
 
flip's Avatar
 
Join Date: Aug 2010
Posts: 18
Transmission/Gear question from new jeep owner

Just bought a 2004 with 100000 miles on it. Body and engine are in great shape. It has been lifted and has 32's on it. I love driving it around town. The challenge is that when I am on the highway, the jeep tops out at 60mph. I was told this is not normal for a 6 cyl. Do you think someone changed the gears? If so, how could I tell and what would the default gears be? Any help to a new jeep owner would be great

flip is offline   Quote Quick Reply
Old 08-31-2010, 11:46 AM   #2
Jeeper

WF Supporting Member
 
6InARowMakesItGo's Avatar
 
Join Date: Aug 2010
Location: right behind you
Posts: 1,863
it depends on what axle you have. pictures of the axle would help identify it.

6InARowMakesItGo is offline   Quote Quick Reply
Old 08-31-2010, 11:49 AM   #3
Knows a couple things...

WF Supporting Member
 
Jerry Bransford's Avatar
 
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 32,374
Images: 2
Quote:
Originally Posted by flip View Post
Just bought a 2004 with 100000 miles on it. Body and engine are in great shape. It has been lifted and has 32's on it. I love driving it around town. The challenge is that when I am on the highway, the jeep tops out at 60mph. I was told this is not normal for a 6 cyl. Do you think someone changed the gears? If so, how could I tell and what would the default gears be? Any help to a new jeep owner would be great
We need to know what transmission you have and what your present axle ratio is. If the factory ratio is still installed, it would be either 3.07 or 3.73. From your lack of performance, I am guessing it has the higher 3.07 ratio. Technically speaking, 3.73 is a lower ratio than 3.07 even though numerically it is higher.

Your ratio is embossed into a steel tag bolted onto the axle's differential cover. The below photo shows that tag and the axle in the example photo has a 3.73 ratio which is circled in red.
Attached Thumbnails
Click image for larger version

Name:	axleratio.jpg
Views:	43
Size:	45.1 KB
ID:	24121  
__________________
When you have a choice, buy American.

Jerry Bransford is offline   Quote Quick Reply
Old 08-31-2010, 05:14 PM   #4
Jeeper
 
Ken Steele's Avatar
 
Join Date: Apr 2010
Location: Fallbrook
Posts: 128
I don't know whose bright idea it was to ever put 3.07 gears into a Jeep, but they should be shot. That's what mine came with and even on factory tires it was a dog on the highway.
Ken Steele is offline   Quote Quick Reply
Old 08-31-2010, 05:28 PM   #5
Jeeper
 
Join Date: Aug 2010
Posts: 151
low gears in the engine mines the same way. it's just the way your engine is not your transmission
NM JEEPS 15 is offline   Quote Quick Reply
Old 08-31-2010, 06:01 PM   #6
Knows a couple things...

WF Supporting Member
 
Jerry Bransford's Avatar
 
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 32,374
Images: 2
Quote:
Originally Posted by Ken Steele View Post
I don't know whose bright idea it was to ever put 3.07 gears into a Jeep, but they should be shot. That's what mine came with and even on factory tires it was a dog on the highway.
Jeep had to ship a significant number of 3.07 equipped Jeeps so the entire fleet of Jeeps could meet the ever increasing EPA CAFE average fleet fuel economy minimums.
__________________
When you have a choice, buy American.

Jerry Bransford is offline   Quote Quick Reply
Old 08-31-2010, 09:59 PM   #7
Jeeper
 
Minn_wild1's Avatar
 
Join Date: Aug 2010
Location: Iron Range, MN
Posts: 194
Images: 3
If it has 32's and tops out at 60, I would bet it doesn't have 3.07's....
__________________
33" BFG A/T's, 2.5" RC w/ 1.25" BL, MORE MML, Custom Bumpers, Home made disconnects, 8.8 LSD and D44 Rubicon Locker 4.10 gears.
Minn_wild1 is offline   Quote Quick Reply
Old 09-01-2010, 08:03 AM   #8
Jeeper
 
flip's Avatar
 
Join Date: Aug 2010
Posts: 18
What do you think it has? What do you think it would cost to change it?
flip is offline   Quote Quick Reply
Old 09-01-2010, 08:05 AM   #9
Jeeper
 
flip's Avatar
 
Join Date: Aug 2010
Posts: 18
ok..I will look when I get home and post what the ratio is ..thx for pic and heads up
flip is offline   Quote Quick Reply
Old 09-01-2010, 09:08 AM   #10
Jeeper
 
crackle's Avatar
 
Join Date: Oct 2009
Location: Delaware
Posts: 92
Is there any other way to tell? I put a diff slider on my rear axle a while back and lost the tab. I did not know it was important. Doh. I have an 03 Wrangler sport with the Dana 44 on the back. It is pretty fast with 30" tires, but moving to 33" in the next week or so.
crackle is offline   Quote Quick Reply
Old 09-01-2010, 10:31 AM   #11
Knows a couple things...

WF Supporting Member
 
Jerry Bransford's Avatar
 
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 32,374
Images: 2
You have 3.73 crackle. All non-Rubicon Wrangler TJs with the factory installed Dana 44 comes with 3.73 gearing.
__________________
When you have a choice, buy American.

Jerry Bransford is offline   Quote Quick Reply
Old 09-01-2010, 10:58 AM   #12
Jeeper
 
Join Date: Aug 2007
Location: So Cal.
Posts: 1,146
Quote:
Originally Posted by flip View Post
Just bought a 2004 with 100000 miles on it. Body and engine are in great shape. It has been lifted and has 32's on it. I love driving it around town. The challenge is that when I am on the highway, the jeep tops out at 60mph. I was told this is not normal for a 6 cyl. Do you think someone changed the gears? If so, how could I tell and what would the default gears be? Any help to a new jeep owner would be great
Now..... do you mean that the engine runs out of power or that the engine has topped out in rpm's, if nothing else use a gps and give us a speed and rpm reading and your trans set up and your gears can be figured that way if the tags are unreadable or missing.

Donn
__________________
My Jeep is NOT an suv and Your suv is NOT a Jeep
30-284 is offline   Quote Quick Reply
Old 09-02-2010, 07:37 AM   #13
Jeeper
 
crackle's Avatar
 
Join Date: Oct 2009
Location: Delaware
Posts: 92
Quote:
Originally Posted by Jerry Bransford View Post
You have 3.73 crackle. All non-Rubicon Wrangler TJs with the factory installed Dana 44 comes with 3.73 gearing.
Thanks Jerry. That puts my mind at ease. I am hoping that the 3.73 has enough torque to handle the 33" tires I will be putting on.
crackle is offline   Quote Quick Reply
Old 09-02-2010, 08:06 AM   #14
Jeeper
 
flip's Avatar
 
Join Date: Aug 2010
Posts: 18
Ok...I just looked. It is definitely 3.07. What do I do now to get more speed? I have the acclerator to the floor...rpms are 2000 and in 5th gear and only going 60 -63 mph
flip is offline   Quote Quick Reply
Old 09-02-2010, 09:00 AM   #15
Jeeper
 
Join Date: Aug 2007
Location: So Cal.
Posts: 1,146
OK so, your running out power, or better yet, your not getting to the engines power band, you will probably need to re gear to get where you need to be, that of which will be determined by your trans and size of tires that you will be running and also whether it is a daily driver or will be a trailer rig.

Donn
__________________
My Jeep is NOT an suv and Your suv is NOT a Jeep
30-284 is offline   Quote Quick Reply
Old 09-02-2010, 11:08 AM   #16
Knows a couple things...

WF Supporting Member
 
Jerry Bransford's Avatar
 
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 32,374
Images: 2
Quote:
Originally Posted by flip View Post
Ok...I just looked. It is definitely 3.07. What do I do now to get more speed? I have the acclerator to the floor...rpms are 2000 and in 5th gear and only going 60 -63 mph
There is an easy fix to that flip, regear your axles (both) to 4.10. Costs for that will be close to $1100-1200. Some shops try to gouge people and quote as much as $1700-1800 but they are just trying to rip people off when they quote that much.

If you think you might go to 33" tires, 4.56 would be the better ratio but if you are sticking with 32", regearing your axles to 4.10 will give you a dramatic improvement in your power. You will be grinning from ear to ear if you regear your axles to that ratio.

__________________
When you have a choice, buy American.

Jerry Bransford 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
Jeep Commander/Wrangler owner adamag25 General Jeep Discussion 39 11-19-2011 10:09 PM
Jeep Confidence Course at Offutt AFB during Air Show! wasomma General Jeep Discussion 0 08-26-2010 03:18 PM
New Jeep owner leak question. East Tn TJ TJ Tech Forum 8 07-26-2010 05:15 PM
Fellow Ohio Jeepers Help fick15 Ohio Jeep Forum 11 01-19-2010 10:56 PM



Download our Mobile App

» Featured Product

All times are GMT -5. The time now is 08:18 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