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Old 01-04-2013, 10:54 PM   #1
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Gear ratio location

Hey guys I was looking through the forums and I was reading through threads on here about the gear ratio location on the diffs. I read that it's supposed to be in the 9 o'clock position on the diff cover. I went out and looked at mine and I can't find it on the front or rear diff. Is it a tag that could have possibly fell off at some point or is it stamped into the diff cover?


Also would it be possible for someone to post pictures of where it's located on their Jeep? I saw one picture but it was to small to really see anything.
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Old 01-04-2013, 11:32 PM   #2
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Yes stock location is 9 o'clock on the diff cover between the two bolts. It is a thin piece of sheet metal probably 3" long and .5" wide. If it were still there you would easily see it on both the front and rear diff. It is pretty common for someone to open the diff and not put these tags back in place.

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Old 01-04-2013, 11:44 PM   #3
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Oh ok, I suppose that's what happened to mine. I reckon I'll contact Chrysler and see about getting a build sheet. Thanks for the info!!
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Old 01-04-2013, 11:57 PM   #4
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Yea get a build sheet and also check the actual drive shaft rotation in regards to the wheel rotation as something may have been changd.
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Old 01-05-2013, 12:11 AM   #5
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I'm really new to all of this so how would I check that?
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Old 01-05-2013, 12:13 AM   #6
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They're easy to forget to put back on when servicing, but they also blend in well between dirt & oil. I couldn't see mine until I took a rag after it.
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Old 01-05-2013, 12:18 AM   #7
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You can email Chrysler your VIN number & they'll send your build sheet. I believe there is website that gets you that info too, but unfortunately I don't have the link to either. I'm sure someone will chime in with the know how.
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Old 01-05-2013, 12:23 AM   #8
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Think this is it...
Contact Jeep
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Old 01-05-2013, 12:53 AM   #9
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Thanks for that link! I filled it out so hopefully I'll have it before to long. How would I check to make sure nothing has been changed?

If I had 3.73 gears would the driveshaft make 3.73 revolutions for everytime a tire made 1 full revolution?
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Old 01-05-2013, 01:29 PM   #10
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That's how I check. Crude...but it works. Jack up the entire rear end when you do this and it helps if you have someone counting accurately. Also when you rotate the tire look at the other tire and see if its going in the same direction or going in the opposite direction. If both are going in the same direction, it indicates you have a locker or limited slip. If they go opposite directions you probably have an open diff. The best way to know for sure what you have is to take the cover off, see what you have and put in new lube.
Be safe and use jack stands.
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Old 01-05-2013, 01:59 PM   #11
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Quote:
Originally Posted by dylan1991 View Post
Thanks for that link! I filled it out so hopefully I'll have it before to long. How would I check to make sure nothing has been changed?

If I had 3.73 gears would the driveshaft make 3.73 revolutions for everytime a tire made 1 full revolution?
Depending on the type of differential inside the axle, you usually have to rotate the wheel twice for the driveshaft to rotate the number of revolutions to equal the ratio.
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Old 01-05-2013, 08:46 PM   #12
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Quote:
Originally Posted by TexasT View Post
That's how I check. Crude...but it works. Jack up the entire rear end when you do this and it helps if you have someone counting accurately. Also when you rotate the tire look at the other tire and see if its going in the same direction or going in the opposite direction. If both are going in the same direction, it indicates you have a locker or limited slip. If they go opposite directions you probably have an open diff. The best way to know for sure what you have is to take the cover off, see what you have and put in new lube.
Be safe and use jack stands.

Alright cool. Luckily Chrysler sent the buildsheet to me today and the factory put 3.73 gears in it. But I think I will still check it as it seems the PO must have had the diff covers off at sometime if the tags were missing. Maybe they regeared it for some reason.

Quote:
Originally Posted by Jerry Bransford
Depending on the type of differential inside the axle, you usually have to rotate the wheel twice for the driveshaft to rotate the number of revolutions to equal the ratio.
When you say depending on what differential I have, do you mean open, limited, or locked?

If so which one would cause me to have to turn it twice to get the draftshaft to make the correct number of rotations?
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Old 01-06-2013, 11:20 AM   #13
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An open diff and some LSDs like a Truetrac will make you spin it twice to get the right number of driveshaft revolutions. If you spin it once and don't get the expected # of driveshaft revolutions, then just spin it one more time.

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