Basically, you can use any hydraulic/tractor oil (5W-30ish) for the rear diff. This is mainly due to the wet brake in the back. In a pinch, ATF will work, but get it out ASAP as the "slip" additives will render your rear brake useless. Fill the front with whatever your using on your oil change. Kawi spec 10W40, but anything that is JASO-MA will work.
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