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Unread 06-23-2013, 11:28 AM   #16
mschi772
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1997 XJ Cherokee 
 
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Location: Racine, WI
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Front axle is likely a D30, but it might be a D44.

To know your gear ratio, if it is stock, there may be a tag attached to the diff cover; though by now many different things could have made it go bye-bye. A build sheet will also tell you if it is stock. If it is totally stock--and you know it is for sure--you can submit your VIN to either Chrysler or Compnine.com to get a complete build sheet.

A simple DIY way of figuring it out yourself:
Quote:
Block your front wheels. Jack your rear wheels off the ground. Put your tranny in nuetral. You'll need a piece of chalk or similar marking device. Make a chalk mark on one of the 4 needle bearing caps on your rear driveshaft, rear U-joint. Then, mark a chalk line from the rim outward somewhere on the inside of one of your rear tires. Start turning that tire and watch the DS too. Count how many turns of the tire it takes to make one full turn of the rear DS. 3 and 1/2 turns equals 3.55:1 gears, 3 and 3/4 turns equals 3.73:1 gears, 4 turns equals 4.10:1 gears, etc.


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Unread 06-23-2013, 11:45 AM   #17
86freeman68
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1986 XJ Cherokee 
 
Join Date: Jun 2013
Location: big stone gap, va
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I'm out at my jeep now and I'm looking under at the axles and to me it doesn't look like any of the ones on that chart thing. Should I post pics?
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Unread 06-23-2013, 01:40 PM   #18
86freeman68
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would it be dana 30 and dana 35c?
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Unread 06-23-2013, 01:55 PM   #19
86freeman68
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What engine does your 87 have?
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Unread 06-23-2013, 04:35 PM   #20
chris87xj
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Odds are pretty good your XJ has 3.55 gears.
Check here for a lot of other great info Cherokee stock specs.
More good info here
Cherokee Tech info
and here XJ lift setups.
Those should keep you busy for a while and answer a lot of your questions.
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Unread 06-23-2013, 05:28 PM   #21
mschi772
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I will also agree with D30 & D35.
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Unread 06-23-2013, 07:29 PM   #22
mschi772
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Quote:
Originally Posted by blackolive99 View Post
I've not ran into anything but 355's with and auto unless it was a 5spd 4cyl 2.5.
But that being said, 5/4 combo usually had 4.10's.
3.07:1 for 4.0 manuals
3.73:1 for 4.0 autos with tow package
4.10:1 for 2.5 auto & manuals
4.56:1 for 2.5 autos with tow package
All others were 3.54/3.55.

Factory gear ratio for all V6 models was 3.55:1, so if you don't think they've been changed, that's what you have.
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