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Old 08-23-2011, 02:33 PM   #1
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Location: Satellite Beach, Florida
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Buying an 88 yj with gearing issues

Im buying a 88 YJ with a I6 258 Jasper engine, 5 speed, 35 inch swampers. It has the stock front end with 308 gears and he was told a used rear end he put in was the same. Clearly it is lower geared than the front end. Any way of telling what I Have without tearing it down? I want to change the front gearing to match whatever the rearend has in it. Never have changed gearing on a front end, any tips would help.

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2004 Jeep Wrangler Rubicon, D 44 Lockers F/R, 410 Gears, 4.0L I6 242, 4 Speed Auto, 4 to 1 Transfer Case, 6 inch Suspension Lift, 35 Kumho MTs
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Old 08-23-2011, 03:41 PM   #2
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if there is no tag on the diff covers, and you don't want to take the cover off to count teeth on the ring and pinion, you can count the revolutions of the yoke compared to axle to get you an idea.
Did you test drive and try engaging 4wd and feel the gearing is mismatched?

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Old 08-24-2011, 04:40 AM   #3
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Yes. I took it in the loose sand and The front wheels were spinning and dragging the rear. In 4 high it would bog the engine on the concrete. The front is way higher than the rear. Pulling the cover is no big deal. Is there a reference sheet I can plug the teeth count into to get the ratio or do I just do the math?
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Old 08-24-2011, 08:23 AM   #4
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Rear Axle Assembly Identification - Ford Products - BumpWiki
Scroll down to "My Data Tag is missing...what now?" It'll show a picture of where the tooth count for ring and pinion is stamped, on a Dana axle. Do the math, Divide pinion into ring count, and you have the ratio.
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Old 08-24-2011, 08:36 AM   #5
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Smile Rear-end size

No need to do any of that if you haven't done it all ready. just jack it up and mark the tire and the drive shaft in one position and rotate tire, count driveshaft revelutions for one turn of the tire exactly, and then do the other. They must match exactly if not, you can figure out which one is wrong, and proceed from there to correct one or both to whatever size rearend you want.
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Old 08-24-2011, 01:42 PM   #6
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if you pull the cover there is some numbers stamped on the rig gear which is the teeth count because even with the tire method, and a tag I wanted to make sure before I went to put it in four hi. You never know what a PO could have done.

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