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"The Gearbox" is not in ANYWAY hooked the the Oil Cooler that is for the engine oil only. If you are speaking of "The Gearbox" as in the Transmission then after having it checked and serviced.
Consider [http://www.amsoil.com/StoreFront/atf.aspx?zo=1163284 Synthetic Universal Automatic Transmission Fluid (ATF)]. But if you are speaking about the Transfer Case then your "Gear lube" may be low.
If it is not low then the Gear Lube itself may not be up to the job of providing the protection needed.
I would consider getting one that is up to the Job. Good Luck and Remember.
Change Your Mind, Not Your Oil.
Use the First In Synthetic Motor Oil's.
See My Bio For more information.

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Q: What would cause 1997 Jeep Grand Cherokee Auto Gearbox to overheat the gearbox oil even though the oil cooler is stone cold?
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