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Old 09-21-2012, 07:06 AM   #1
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Gear Ratios?

I am lifting my jeep and adding 33" tires. I know there are speedometer correction gears available, but I need to know what gear ratio my differentals are. Can you find out with your VIN #? or am I gona have to pop the cover and count the teeth? Its a 99 wrwngler w/ 4.0 6cyl and 5 speed.
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Old 09-21-2012, 07:12 AM   #2
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There should be a tag on tha diff housing. Vin's do not have that info.

Retired my 94 YJ 4cyl 5spd @ 200K
Now in a 04 TJ 4cyl 5spd CV @120K+
Both as a commuter vehicle in NW, NJ
April 2012.downsized and now a 99er.
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Old 09-21-2012, 08:01 AM   #3
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If you dont have tags on your diff, use this helpful sheet:

Jeep Parts, Jeep Accessories & Jeep Soft Tops From The Jeep Parts Experts - Quadratec
One day, you will be just a memory for some people. Do your best to be the good one.

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Old 09-26-2012, 03:38 PM   #4
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I have the same 99 4.0. TJ. The tag reads 3.07. Dana 35. But I can't speak for yours.
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Old 09-26-2012, 04:27 PM   #5
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Yep look at either your front or rear axle for the above mentioned tag that the ratio will be embossed into. Depending on if you look at the front/rear, the ratio will either be 3.07/3.08 or 3.73/3.74 since the front and rear axle ratios are .01 apart from each other.
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