Tractor Supply Co. 90 weight Ford tractor transmission oil is a direct replacement for the straight mineral oil specified for the transmission and transfer case. It does not have the hypoid additives that supposedly attack brass synchronizer rings.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!