The only way to tell is by counting the number of turns the pinion gear makes compared to the axle. As far as the engine size, it should be listed under the hood on one of the factory lables. It is either a 3.0L or a 4.0L.
NOTE: If you call a dealer with the VIN number, they may be able to tell you what differential you have.
Let me know what you find.
Joe
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Monday, August 23rd, 2010 AT 10:35 PM