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Old 08-29-2012, 07:33 PM   #1
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Gear Classification

So after much planning and saving, I was able to purchase my jeep a couple months back. Well actually, I was on deployment so my wife made the purchase. She wanted an automatic and I wanted a manual, so she beat me to it by purchasing it herself. Awesome jeep with some extras. It already has a 4in lift and 35's on with stock Dana 35 rear and 30 front. I know that I need a stronger rear axle.

My question is, is there anyway for me to tell what size gears are in it? Someone wrote in paint marker 3.07 on the front axle, but I highly doubt that's right. It's a 2000 TJ 4.0 and when doing 65mph on the highway I'm at like 2500 rpm.

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Old 08-29-2012, 07:38 PM   #2
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there should be a tag on the rear axle that will say it

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Old 08-29-2012, 07:52 PM   #3
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Quote:
Originally Posted by kpla51
there should be a tag on the rear axle that will say it
Whereabouts?
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Old 08-29-2012, 08:28 PM   #4
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on the gear housing the tag could be hard to see since they get gunked up over time should be on the left side of the housing closest to the bumper

there also is ways of checking the gear ratio by tire to drive shaft rotation but i don't know that method
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Old 08-29-2012, 08:41 PM   #5
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If there isn't a tag look at the driveshaft and rotate the wheels, rotate the wheel once and have someone look at the shaft and see how many times it spends. So let's say you have a 4.10, the shaft will rotate 4.10 times and the wheel will rotate once.
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Old 08-29-2012, 09:08 PM   #6
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I appreciate the help. It seems like the previous owner installed the lift and tires and never bother with the basic maintenance. What fluids should I change in this 12 year old jeep?
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Old 08-29-2012, 09:11 PM   #7
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Ide go ahead and change them all, since you just got it, there's no telling when the last owner changed them... I like to know when I need to change everything on my jeep...
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Old 08-29-2012, 09:36 PM   #8
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The automatic trans from 1997-2002 was the 3 speed 32rh without overdrive.

Doing 65 with 35 inch tall tires (actual height) would yield:
2565 rpms with 4.11s,
2328 rpms with 3.73,
1916 rpms with 3.07s

It is possible that he has the wrong speedometer gear though, you should probably double check your speed with a digital GPS.
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Old 08-30-2012, 08:36 AM   #9
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What would you recommend for gear size for my current setup if I plan to use this jeep as my DD and occasional offloading?
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Old 08-30-2012, 08:54 AM   #10
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4.56 is the perfect setup for 35's and the 32rh 3 speed auto
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Old 08-31-2012, 10:41 AM   #11
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Here's the tag
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Old 08-31-2012, 10:42 AM   #12
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Quote:
Originally Posted by kpla51
Here's the tag
3.73 gears.
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Old 08-31-2012, 11:25 AM   #13
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Quote:
Originally Posted by NCCoumbe

Whereabouts?
Like in my picture on the left look for a tag on yours but the fact that you're doing 2500 rps at 65 makes me believe you have 4 10 what seize tire do u have

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