View Full Version : 1988 f350

07-24-2008, 06:41 PM
recently bought a 88' dump truck... it was a complete steal for only $1,100!!! only 33k original miles on it... did a bit of rusting but time will do that... so anyway, I hadn't gone out to get the book yet but does anyone know what type of oil to use for the gearbox? i couldn't find it on google... let me know thanks

07-25-2008, 04:57 PM
I'd call Ford

07-26-2008, 11:44 AM
85-w90 Gear oil.

But heavy-duty 85-w140 is better.

07-26-2008, 05:54 PM
Is it a 5 speed? What engine? The 460 and diesel trucks need synthetic mercon ATF.