This is a discussion on front diff and rear diff within the Kodiak/Big Bear/Bruin/Wolverine Discussion forums, part of the Other Yamaha Forums category; what kind of gear/oil does the front diff take?...
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Ya, each diff only holds a little more than approx. 0.2 of a litre I believe.
Not sure which quad or year you have, but the only other thing to check for is to make sure you don't have the internal rear brakes. If so you have to be careful which gear oil you use.
Also some Yamaha diffs have separate fill plugs and check level plugs.
So be careful or you could over fill your diff.
If you have a manual all this information is in there, and if not , the manuals are available for free on the Yamaha site I believe.