during my truck restoration, i am currently working on the brakes and rear end. i am goin to be changing my rear diff cover gasket, and am wondering what rear diff fluid and weights you guys recommend for my truck application. its a 77 F250 with a D60 rear

 

IMO... as thin of oil as you can get away with.

I put Mobil-1 75W-90 gear oil and Stay-Lube friction modifier in my re-built Ford 9". (75W-90 gear oil is like 10?W-50 engine oil, but I ain't in Ohio;)

Would have not added the friction modifier if I didn't have to. :)

Funny how the Mobil-1 bottle's salesman's hype and jive made like it could
be used for -anything- -just as it is- and my Traction-Loc clutch plates squalled
to beat hell without the friction modifier. Funny huh? ;)

Alvin in AZ
ps- why doesn't Scol's location show up and make it so it has to "looked up"? :/

 

I am a genius who uses what ever is in stock at the parts house that comes in a 5 gallon bucket and says gear oil. Depending on where you live, for the most part you have two choices on which weight you can run. If its cold, I would run the thinner of the fluids, but if you in a warmer climate, I would not see an issue with the thicker stuff. I have not had a rear end seize up with either weight. If you have a limited slip, you need to pony up for the friction modifier or you might get alvins results with the chipmunk chatter.

 

Well you are certainly smarter than you look. ;)

A friend of mine in Arkansas was really upset when he got a job in an oil
bottling plant in east Texas and saw his favorite Havoline bottles go down
the line and get oil out of the same hopper the store brand bottles were
getting.

Hey, if it meets spec it meets spec. :)

Told my dad that story, his favorite being Havoline too, he didn't believe it. :(

Alvin in AZ