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Old 08-31-2010, 11:34 AM   #1
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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

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Old 08-31-2010, 11:46 AM   #2
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it depends on what axle you have. pictures of the axle would help identify it.

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Old 08-31-2010, 11:49 AM   #3
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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.
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Old 08-31-2010, 05:14 PM   #4
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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.
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Old 08-31-2010, 05:28 PM   #5
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low gears in the engine mines the same way. it's just the way your engine is not your transmission
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Old 08-31-2010, 06:01 PM   #6
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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.
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Old 08-31-2010, 09:59 PM   #7
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If it has 32's and tops out at 60, I would bet it doesn't have 3.07's....
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Old 09-01-2010, 08:03 AM   #8
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What do you think it has? What do you think it would cost to change it?
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Old 09-01-2010, 08:05 AM   #9
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ok..I will look when I get home and post what the ratio is ..thx for pic and heads up
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Old 09-01-2010, 09:08 AM   #10
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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.
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Old 09-01-2010, 10:31 AM   #11
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You have 3.73 crackle. All non-Rubicon Wrangler TJs with the factory installed Dana 44 comes with 3.73 gearing.
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Old 09-01-2010, 10:58 AM   #12
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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.

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Old 09-02-2010, 07:37 AM   #13
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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.
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Old 09-02-2010, 08:06 AM   #14
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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
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Old 09-02-2010, 09:00 AM   #15
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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.

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Old 09-02-2010, 11:08 AM   #16
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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.

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