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Mine is a bit sluggish like that too for a couple miles in cold weather, even with fresh lubes. Part of it is thick wheel bearing grease, etc. It doesn't really do it in the summer though.
As far as gear oil, I'd go with 75W-90 front and rear. However, if you plan to take it offroad, tow with it, or any other use that stresses the axles, I'd bump the rear up to 75W-140 (as suggested in the manual).
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Call me crazy, but I actually try for mpg with this Jeep:
Typical driving: Back in Rochester for school, driving is 60 - 70% city
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