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Unread 03-18-2013, 09:06 AM   #1
hrdwreman
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Gear ratio question.

I am trying to determine the gear ratio that is in my 00. The numbers on the diff are 07-5993-2 and 111764AB. These don't seem to be the same numbers that I have read on other threads that would tell me. I thought I had read that the first numbers would be the ratio. Thanks for any help.

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Unread 03-18-2013, 09:08 AM   #2
jeepinhokie
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Quote:
Originally Posted by hrdwreman View Post
I am trying to determine the gear ratio that is in my 00. The numbers on the diff are 07-5993-2 and 111764AB. These don't seem to be the same numbers that I have read on other threads that would tell me. I thought I had read that the first numbers would be the ratio. Thanks for any help.
based on your trany you most likely have 3.07s.

there are other ways of identifying your gear ratio though.

jack your rear end up and rotate your tire one full revolution, while rotating the tire count how many times the driveshaft spins. if it spins 3 times you have 3.07, if it spins closer to 4 you have 3.73s
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Unread 03-18-2013, 10:41 AM   #3
2jhanna
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If your rear end and cover is stock, there should be a small metal tag between the cover bolts at the 9 o'clock position. crawl under there with a rag and flashlight, the will be many numbers but you should se something like 3 07 or 3 73.
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Unread 03-18-2013, 10:51 AM   #4
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Your axle ratio is embossed into this tag as is circled in red below. The factory installed tags onto both the front & rear axles.
axle-ratio.jpg  
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Unread 03-18-2013, 01:12 PM   #5
hrdwreman
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yeah, i had seen those threads before and the numbers that are on my tags is what i put in the first thread. thus the confusion. thankls.
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Unread 03-18-2013, 01:16 PM   #6
1982cj8
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some of the Jeeps do not have a tag but the same numbers are embossed on the cover itself.
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Unread 03-18-2013, 01:20 PM   #7
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You don't have to guess. Jack the rear end up, both wheels off the ground. mark a position on the tire and on the rear drive shaft. Put it in neutral and start rotating the tire. Count how many times your drive shaft rotates during one rotation of the tire. That will be your ratio.

*edit - oops, what jeepinhokie said..
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Unread 03-18-2013, 01:37 PM   #8
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the 3 on your "07-5993-2" will be right next to the bolt. It's hard to see. You have 3.07 gears.
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Unread 03-18-2013, 02:02 PM   #9
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Ohhhhhh noooooooo!!
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Unread 03-18-2013, 03:10 PM   #10
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Quote:
Originally Posted by socaldaveh View Post
You don't have to guess. Jack the rear end up, both wheels off the ground. mark a position on the tire and on the rear drive shaft. Put it in neutral and start rotating the tire. Count how many times your drive shaft rotates during one rotation of the tire. That will be your ratio.
You have to rotate the tire precisely two revolutions with an open differential for it to rotate the driveshaft the correct number of times to equal the axle ratio.
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Unread 03-18-2013, 06:26 PM   #11
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Another way to determine your ratio:

3.07 = 2,000-2,100 RPM at 60 MPH
3.73 = 2,400-2,500 RPM at 60 MPH


Note: This is for 33" tires with the 3 speed auto in 3rd gear.

Last edited by Wheelin98TJ; 03-19-2013 at 10:02 AM.. Reason: Added note to clarify tire size and trans gear
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Unread 03-18-2013, 07:33 PM   #12
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Originally Posted by alton438 View Post
the 3 on your "07-5993-2" will be right next to the bolt. It's hard to see. You have 3.07 gears.
Me thinks if you brush the tag a bit, you'll find a 3 buried in the grime before the .07. You can't win 'em all...
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Unread 03-19-2013, 05:15 AM   #13
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Quote:
Originally Posted by Wheelin98TJ View Post
Another way to determine your ratio:

3.07 = 2,000-2,100 RPM at 60 MPH
3.73 = 2,400-2,500 RPM at 60 MPH
that might be a difficult way to determin gear ratio. does it take tire size into consideration, or are those stock specs?
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Unread 03-19-2013, 06:46 AM   #14
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Quote:
Originally Posted by jeepinhokie View Post
that might be a difficult way to determin gear ratio. does it take tire size into consideration, or are those stock specs?
tire size IS part of the equation. OP's profile states 33", I would assume Whellin98 took that into consideration.
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Unread 03-19-2013, 10:01 AM   #15
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Quote:
Originally Posted by jeepinhokie View Post
that might be a difficult way to determin gear ratio. does it take tire size into consideration, or are those stock specs?
Quote:
Originally Posted by 2jhanna View Post
tire size IS part of the equation. OP's profile states 33", I would assume Whellin98 took that into consideration.
Yep, thanks for clarifying that.

For my calcs above, I used a 33" tire with an actual size of 32.4".
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