They come standard with the 3.21 axle, Dana 30 front axle, and Dana 44 rear axle. You can also contact the dealer or go to jeep.com and request a build sheet.
You can also mark the driveshaft with chalk or something, throw it in neutral, and spin a tire by hand while counting how many times the driveshaft rotates.
Actually that would work, but it would be off by a factor of two due to the action of the differential. I.e. if you have one wheel locked and the other jacked up and free to rotate.
It's very simple, to do, without dis-assembling, or draining your oil!
And I am agreeing with Post number 9!!!
Jack up both rear wheels, and put your trans in neutral. Put a piece of masking tape across the tread on one tire. Next put a piece of masking tape on one spot on your rear drive shaft. Turn your tire and wheel 10 full revolutions, stopping in the same place that you started. As you are turning your wheel through the ten turns, be counting the drive shafts revolutions. It's easy to see, because of the tape.
So Example: At the end of the full 10 wheel revolutions, your driveshaft had 41 revolutions, then you divide 10 into 41, which tells you that you have a 4.10.
For that to work accurately, you have to be sure that the two rear wheels turn exactly the same amount or you will not get an accurate measurement. Just because one wheel turns 10 times, doesn't guarantee the other wheel turned by the same amount.
You can jack up one rear wheel with the other solidly on the ground, mark the wheel and drive shaft, do the count, divide the wheel turns by the drive shaft turns and then divide that by 2 to cancel the effect of the diff.
Just entered vin like post #20 said after = sign in address bar. Got every option listed on my 13 Wrangler. Just make sure you use capital letters not lower case. Axle ratio was listed. Thanks was wondering what axle ratio I had.
One other way to determine the ratio. On your axles, I could only find it on the front on mine, there will be a paper sticker with PN xxxxxxxx-1 on it. This is the axle's Build of Material number. Go to Dana's website. When you key it in, it will give you all the info on what is contained in that particular axle. Ratio,bearing numbers, gear numbers, open, limited slip, lockers etc.
Do yourself a favour and write the numbers in your owners manual. They don't last long on paper stickers, and supply handy info when re gearing.
Go to Jeep.com, owners, owners site log-in, log on to owners site or register and log in,
you should be on the page for your Jeep, select Learn & Use menu, then select equipment thsi will show the build sheet for your Jeep
Try Here
go to vehicle equipment listing and enter your vin # Jeep - Contact Us
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