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Old 10-24-2009, 11:02 AM   #1
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Gear Ratios?

Today, when looking at my 2000 Jeep Wrangler 4.0L 5spd, I wanted to see what gear ratios I had in my axles. The rear axle was hard to read because of all of the dirt/grime that built up. The front says that I have a 3.73 ratio. Are the front and rear ratios the same?

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Old 10-24-2009, 11:04 AM   #2
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The front says that I have a 3.73 ratio. Are the front and rear ratios the same?

Yes . . . if they weren't, you'd have one hell of a wild ride in 4x4 when either the front or rear axle was spinning faster than the other . . . then again the wild ride would probably only last for a short time and then you'd hear a loud noise!!!

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Old 10-24-2009, 11:05 AM   #3
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yes they are or the truck would not move in 4 wheel drive.
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Old 10-24-2009, 11:07 AM   #4
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Thanks for the responses. Does this ratio mean that I have an open differential?
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Old 10-24-2009, 11:15 AM   #5
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Thanks for the responses. Does this ratio mean that I have an open differential?
The only model that comes with lockers stock is the Rubicon. The gear ratio doesn't have to do with the locker though.
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Old 10-24-2009, 05:25 PM   #6
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Thanks for the responses. Does this ratio mean that I have an open differential?
Not by itself. Here is a quick test passed on to me by Wind_Rocker:

- block the front wheels to prevent the jeep from rolling;
- put the transmission in neutral;
- release the parking brake;
- jack one of the rear wheels off the ground and try to spin it by hand.

If you have an open differential the wheel will spin freely. If it is difficult or impossible to turn the wheel you have a limited slip differential... assuming you don't have lockers and have them in the locked position. If you have a limited slip differential you should find an "LS" at the end of a line of text on that hard to read tag on the rear differential.
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Old 10-24-2009, 08:18 PM   #7
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yes they are or the truck would not move in 4 wheel drive.
It would move, but not very far.
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Old 10-24-2009, 10:47 PM   #8
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It would move, but not very far.
And then very bad things would happen. Non of which are cheep to fix!

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