Transfercase fluid

sledfreak · Mar 10, 2012

I know in the manual it says motorcraft transfercase fluid but isn't really trans fluid? and if it is what do you guys think about running royal purple atf in it.

rlpzzz · Mar 10, 2012

sledfreak said:
I know in the manual it says motorcraft transfercase fluid but isn't really trans fluid? and if it is what do you guys think about running royal purple atf in it.

FWIW, I've heard some negative opinions on Royal Purple but I recently changed my and used Mobil One. It's easier to find and cheaper than the RP.

sledfreak · Mar 10, 2012

I run mobile 1 for the motor but this is going into the transfercase.I never heard these negitive opinions on royal purple other than it is not cj-4 rated.I used their gear oil for years it works great, don't need a friction modifer with it for locking diffs either.

outacntrl · Mar 10, 2012

It looks like trans fluid but it was cheaper so I went ahead and got the right stuff. When I asked around the dealer I was told they use trans fluid if they don't have the other stuff but nobody could tell me what the difference was.

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rlpzzz · Mar 10, 2012

sledfreak said:
I run mobile 1 for the motor but this is going into the transfercase.I never heard these negitive opinions on royal purple other than it is not cj-4 rated.I used their gear oil for years it works great, don't need a friction modifer with it for locking diffs either.

I was referring to the Mobile One ATF. I may not be understanding your last sentence but I would not use a gear oil in the transfer case.

WoodBoy · Mar 11, 2012

I think these trannys call for Mecron V right? I cant remember what it was but they changed it. Maybe it was Mecron V and they changed it to something else

sledfreak · Mar 12, 2012

No they call for mercon lv but before that sp.

sledfreak · Mar 12, 2012

rlpzzz said:
I was referring to the Mobile One ATF. I may not be understanding your last sentence but I would not use a gear oil in the transfer case.

No,not at all the diffs stands for differential hence the gear oil.

amarillo250 · Mar 12, 2012

after replacing my transfer case a transmission builder told me to use the mopar tranny oil, it stands better up against the head. 20k later, my fluid still looks like the first day and it works great so far, even with negative 15-20 on the thermometer.