Hi Folks:

My truck is a 1965 F250 with the Dana 60 Limited Slip rear axle. I've only had the truck a short while and am changing the rear axle oil for the first time. The stuff that came out was thicker than molasses. The new stuff I put in that came from the local part store was a lot thinner. Here's what I bought:

Valvoline SAE 80w-90 Limited Slip. The bottle says "recommended for all hypoid differentials where API GL-4 or GL-5 fluid is specified."

Parts guy says this is correct for a limited slip axle, but I'm wondering if this applies to an old truck like mine or only to modern truck limited slip axles. Did I buy the right stuff?

Thanks,

Gene

 

Originally: 90 weight gear lube + 4 ounces of friction modifier used with Limited Slip.

 

You still need to add the friction modifyer to the gear oil. Hypoid refers to the bevel cut gears, not the limited slip.

Matt