hypoid lubricant for read differential?

[Mr_Accord]

I'm going to change the oil in the rear differential of my 93 ford aerostar and in my haynes manual it states to use a HYPOID lubricant? what is that?

 

[tomcat27]

I think that gl4 & gl5 cover hypoid lubes. basically a hypoid lube is required by the type of gears that are used in that differential as they stress the lube alot.

 

[Mr_Accord]

is that what I should be looking for when I go to an autoparts outlet?

 

[MolaKule]

The GL5 protection rating covers hypoid differentials.

Just about any mineral 80W90 or synthetic 75W90 will have a GL5 rating (here's some readin' material for you):

http://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=729255#Post729255

http://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=729289#Post729289

 

[chevrofreak]

Hypoid gears have a lot of sliding action across the teeth, and they require a lot of extreme pressure additives to prevent tooth decay.

I think a good 75W-90 GL-5 synthetic gear oil would serve you well.

 

[Mr_Accord]

synthetic oil for a car that oil?

 

[unDummy]

Why not? Diff age doesn't disqualify the type of fluid, his budget does!

 

[mechtech2]

Right. Hypoid gears turn the power direction 90 degrees.
From the driveshaft to the wheels is 90 deg..
The gears do indeed slip a bit against each other, and have very high local pressure spots.
A true rear end differential oil is required. Normally, the bottle will say if it is suitable for differentials and will be GL5.