Mar 5, 2010 #1 N Nazty 4X4 Full Access Member Joined Jul 17, 2007 Messages 65 Reaction score 0 Location Chatsworth, NJ What is a good gear oil (weight and brand) for a 1999 f350 w/ factory 4.56 gears and limited slip?
Mar 6, 2010 #2 JLDickmon ursus combibo Joined Jun 22, 2006 Messages 4,173 Reaction score 12 Location 49041 75w140 GL5 Spec gear oil Motorcraft, Valvoline, etc. plus a Ltd Slip additive from like O'Reilly's for like seven bucks..
75w140 GL5 Spec gear oil Motorcraft, Valvoline, etc. plus a Ltd Slip additive from like O'Reilly's for like seven bucks..
Mar 6, 2010 #3 N Nazty 4X4 Full Access Member Joined Jul 17, 2007 Messages 65 Reaction score 0 Location Chatsworth, NJ i put 80 90 in w/ limited slip additive
Mar 7, 2010 #4 JLDickmon ursus combibo Joined Jun 22, 2006 Messages 4,173 Reaction score 12 Location 49041 not quite as thick, but the shear & film strength is in the additives.. you're fine
