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Old 08-15-2012, 08:07 PM   #1
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speedometer gears

I replaced my speedometer gear today to account for new tires...the gear I pulled out was a 30 tooth gear. None of the charts I show indicate 30 tooth gears...

The jeep had 32" tires when I bought it, no idea if the speedometer gear was replaced by the p.o or not, so is 30 teeth stock or if not what is it?

I'm curious because I wondered if the speedo was accurate before or not

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Old 08-16-2012, 05:22 AM   #2
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30 tooth is usually stock gear if your jeep was born with 3.07 gears and the 28/29in stock tire packages. Your speedometer would have been reading low on bigger meats. for 32's you probably need a 27tooth assuming 3.07s. Keep in mind most tires measure smaller than their nominal diameter (i.e. many 31's are really closer to 30in) - some of the charts I have run into on the 'webs are based off nominal diameter, you may have to to up one tooth depending on your tire package.

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Old 08-20-2012, 12:18 PM   #3
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Quote:
Originally Posted by c_goodnow
I replaced my speedometer gear today to account for new tires...the gear I pulled out was a 30 tooth gear. None of the charts I show indicate 30 tooth gears...

The jeep had 32" tires when I bought it, no idea if the speedometer gear was replaced by the p.o or not, so is 30 teeth stock or if not what is it?

I'm curious because I wondered if the speedo was accurate before or not
What gears do you have? I'm looking for one for my TJ with 3.73 gears and 33s
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Old 08-20-2012, 09:27 PM   #4
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how do i find what gears i have?
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Old 08-21-2012, 08:55 PM   #5
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Originally Posted by mickeygriffin
how do i find what gears i have?
There is a tag on the axle cover if not I did this on my ZJ it's stamped on the gears them selfs but you have to change the fluids do you know your axle?
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Old 08-21-2012, 09:22 PM   #6
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There is a tag on the axle cover if not I did this on my ZJ it's stamped on the gears them selfs but you have to change the fluids do you know your axle?
If a PO changed the gears would the tag get changed to reflect the new gears?
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Old 08-21-2012, 09:42 PM   #7
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After reading this thread made me go look for my stock speedo gear and its a 30 tooth i had 307 gears I6 5 speed X model 2003 235 tire i think where stock on it hope this helps answer your questions
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Old 08-21-2012, 09:57 PM   #8
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My Jeep has 3.73 gears but still had the 30 tooth
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Old 08-21-2012, 10:26 PM   #9
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it hope this helps answer your questions
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Old 08-22-2012, 06:29 AM   #10
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Originally Posted by lifted tj View Post
There is a tag on the axle cover if not I did this on my ZJ it's stamped on the gears them selfs but you have to change the fluids do you know your axle?
no but im certain its stock?
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Old 08-22-2012, 07:37 AM   #11
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Originally Posted by MySahara View Post
If a PO changed the gears would the tag get changed to reflect the new gears?

No
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Old 08-22-2012, 08:20 PM   #12
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Originally Posted by mickeygriffin

no but im certain its stock?
You can do what I did call a dealer and give them your vin and they can look it up and see what it came with, but if there's no tag best thing to get a for sure answer pull off the cover and look at the gears the ratio is stamped on it, look up a pic of a Dana 30 and a Dana 44 your front is most likely to be a 30. But the rear my not be. But you can tell by the cover, look up my post in here there is a pic of all the diff covers from a guy that helped me with mine.
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Old 08-22-2012, 08:23 PM   #13
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Quote:
Originally Posted by MySahara

If a PO changed the gears would the tag get changed to reflect the new gears?
No it would show the stock gears, what problems are you having? I may be able to help or point you to someone who could.

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