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Old 02-29-2012, 02:35 PM   #1
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Tooth count on speedo gear for 31's

This will probably be a quick answer, but I just recently bought a 00 wrangler from someone who had put 31's on it, but no lift, or speedo gear, like they just bought the tires and slapped them on...
I won't get started on all the other things they just "slapped together"... like the stereo.... and the shi**y seat covers....
but i'll bring it up to par, don't you guys worry, I just want to know the tooth count to get on the speedo gear so I can know exactly how many mpg, and how fast i'm going... i fly by people at "60" on the highway, so i know it's not correct

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Old 02-29-2012, 02:41 PM   #2
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bump for quick help, want to order the part asap

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Old 02-29-2012, 02:45 PM   #3
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I would worry about other things in need before the speedo gear. 31 inch tires are not going to have that huge of an effect on accuracy and you will never have a truly accurate mpg with any mixture of speedo gears and larger tires.
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Old 02-29-2012, 02:47 PM   #4
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It will depend on what your rear gears are. If you have 3.73 rear gears you will need a 33 tooth gear. If this is what you need, I have one that you can have.

If you haven't changed one before it is super easy. Takes less than 5 minutes. Here is a good writeup on the steps.

'98 TJ Speedometer Gear
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Old 02-29-2012, 02:48 PM   #5
Knows a couple things...

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Here's the link and chart... Changing Your Jeep Speedometer Gear

In addition to the tire size, you also need to know what axle ratio your TJ has.
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Old 02-29-2012, 02:51 PM   #6
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thanks guys, appriciate the help, my biggest worry is getting carried away with the sound of my new banks headers and getting pulled over for a speed i thought i was going much less than

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