On the TJ, the case should be an external slip yoke for the rear shaft, so it wouldn't lose any fluid. 200+ lbs sounds right for the front axle, but keep in mind, the empty beam axle that replaces it in a 2wd setup is still easily 100lbs.
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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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