Changing Front Diff Ratio -
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Unread 09-08-2012, 01:58 PM   #1
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Changing Front Diff Ratio

Hi all,

I just swapped by blown front diff with one from a wrecker. It said 3.55 on it (stamped), but after realizing there was a problem, I did the wheel turn counting "thing" and discovered it is 3.73. Really would rather not try to find another front diff. Wondering what it would take to change the gears to 3.55? Is it a complete rebuild, or easier? Can a home mechanic do it, or should I take it in?
'99 Jeep Grand Cherokee Laredo
Thanks for your help.

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Unread 09-08-2012, 06:02 PM   #2
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No I would go shop only on that one.
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Unread 09-09-2012, 12:36 AM   #3
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thats a pretty tough job to get it right. last time I checked a new ring and pinion were about $250 and labor isnt cheap on that either. It might be cheaper to find another axle.
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Unread 09-09-2012, 03:36 AM   #4
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If the jeep has any modifications and or you wheel it I would swap the rear gears if anything. Nothing wrong with a little more gearing. Gears are a fairly time consuming and very particularly set up thing.
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