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Old 01-01-2011, 08:10 PM   #1
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Gear ratio?

i want to know if my gears in my jeep are stock or what is there any way to tell? help

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Old 01-01-2011, 08:15 PM   #2
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I went through this dilemma with my Mustang. I was told there isn't a reliable way to tell other than measuring RPM's at the crank and then at rear wheels (which is a pain) or actually taking apart your rear diff. Not sure if it's the same for jeeps, but I'd imagine so.

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Old 01-01-2011, 08:17 PM   #3
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Originally Posted by jeep-sahara-green View Post
i want to know if my gears in my jeep are stock or what is there any way to tell? help
post your speed, gear, and RPM and compare to other stock ones.
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Old 01-01-2011, 08:33 PM   #4
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jack up the rear end: Rotate the tire one full turn and count the rotatiions of your drive shaft. That is your ratio.

If you do not have positraction (both wheels spin same direction when you spin one side) you will have to rotate your wheel 2 revolutions to get 1 full turn. Jeep ratios for the TJ's are 3.07, 3.73, 4:10 Pretty easy to determine which one you got
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Old 01-01-2011, 09:08 PM   #5
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the ratio should be on a diff cover tag.... clean your diff off if you can't find or read it
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Old 01-01-2011, 09:09 PM   #6
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Mine was labled 3.73
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Old 01-01-2011, 10:40 PM   #7
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Originally Posted by CapnDean View Post
jack up the rear end: Rotate the tire one full turn and count the rotatiions of your drive shaft. That is your ratio.

If you do not have positraction (both wheels spin same direction when you spin one side) you will have to rotate your wheel 2 revolutions to get 1 full turn. Jeep ratios for the TJ's are 3.07, 3.73, 4:10 Pretty easy to determine which one you got
+1 Heck of alot easier than counting the teeth. Put a peice of tape on the tire and one on the d/s for reference points. If the d/s turns a little more than 4 times its 4.10's. Little less, its 3.73's, and you get the picture. The tag on the diff is only good if it has stock gears still in it. My Stang still has the 3.27 tag on it, and it has 3.73's.
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Old 01-02-2011, 03:23 AM   #8
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Originally Posted by CapnDean View Post
jack up the rear end: Rotate the tire one full turn and count the rotatiions of your drive shaft. That is your ratio.

If you do not have positraction (both wheels spin same direction when you spin one side) you will have to rotate your wheel 2 revolutions to get 1 full turn. Jeep ratios for the TJ's are 3.07, 3.73, 4:10 Pretty easy to determine which one you got

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