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Re: Wrong Fluid!
A Jeep specialty shop did the same to me a few years ago.
They claim the gear oil is better for the case, especially if it gets lots of heavy duty off road use in low range.
I was concerned the ATF fluid (as specified by the manufacturer) is much thinner and can lube the tight clearance bearings better, especially at highway speed.
IMO if you use the Jeep mostly for on-road use, drain the gear oil and put in ATF. I do not think a 'flush' is necessary.
I did this drain and fill to mine with no problems.
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