it does list ATF but for Cold climates not warm or racing environments
Is that where it comes from? Didn't know that. Back in the 80's, early 90's, everybody I knew with a 833 used ATF4. Using 75/90 or whatever it was worked ok if you shifted slow, like a leisurely drive to work. But if you wanted to get on it, upshift/downshift aggressively, the thicker oil didn't play well with the syncros. Change out to atf4 and slam the gears as hard as you want.