Hey Guys,

Quick question.... who is running "what" for rear end fluid?
I have a Nostalgia Super Stocker... 3200LBS... ford 9 inch....
Doing a fluid change...looks like 90/10 to me.. I know some guys are running synthetic fluid but Im not so sure I like it for rear gears! Seems to me that the gears would be better protected by a petroleum based product due to the heavy loads and shock factors... what do you guys think?

Thanks..