GL4 vs. GL5 - Toyota Transfer Case

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I'd say it depends on how many fluids you want to carry. Amsoil's site confirms that both are spec'd for the t-case.
 
Transfer cases it don't matter.

They oft spec ATF in them, when they are the same as the manual tranny.

If your gearbox is GL4, then use that.
 
I would use a GL5. In rarely maintained transfer cases, any added protection will help.

I've seen too many gear, bearing, bushing, chain... failures in transfer cases. Use the best fluid always.
 
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