What oil to replace rear axle differential oil?

[MarcDeSoto]

The gear oil in my 48 DeSoto differential is supposed to be 90W gear oil.  O'Reilly's didn't have that, so I bought SAE 85W-140 gear oil.  On the back of the bottle, it says this oil is good for manual transmissions, conventional differentials, rear axles, and steering gear boxes.  I did not buy the synthetic gear oil, which costs more or the one for partial slip differentials.  Did I pick the right oil for the differential of my 48?  

[Plymouthy Adams]

GL5...you got the right stuff....when it says conventional axle....it is referring to the fact it does not have the additives for posi-trac...if and when you are in doubt.....refer to your book in the lubrication section...this is still very applicable today...

[Andydodge]

Hypoid 90W.........is all you need, which is some new fangled lingo is GL5...........andyd

[MarcDeSoto]

The bottle I got does say GL 5, but it is 85W - 140.  The clerk said if I wanted the straight 90, he would have to see if he could order it.  Is that necessary or is what I got OK?

[Dodgeb4ya]

With 85-140 you got it covered...

Good for the North Pole❄

Good for the Mojave Desert?

Also dandy oil for a slightly worn gear set...You did fine.

[MarcDeSoto]

Thanks Dodge, I don't think I'll be at the North Pole, but the Mojave is almost in my backyard!  Thanks and Happy New Year!