Ok...I want to replace the automatic tranny fluid & rear axle fluid in my 91 Toyota truck. Does anybody know what I need to replace it with...I want to use Royal Purple cause Ive been told it works great! Thanks Donny

Royal Purple is expensive.

I think its 80-15 gear oil for the axle. Look in the manual if you have one for the Auto fluid. There should be a specific type that it can take. Or someone here with an Auto might know.

i think the diff fluid is just 80-90 wt. gear oil...fill it up till it comes out. basically like you would for the manual trannys..same concept. (at least this is how it is on my 88)

yeah the diff. is 90wt! auto transmission???? what's that??? lol
can't help you there dude!

their max atf will do the tranny.