What Gear oil for diffs & Gearbox's?

[Lionelgee]

Originally Posted by Ganmain Tony

Dipping into the great wisdom of Mluers

I know this question has been asked before & if you can guide me to the thread that would be great.

1941 Chevy truck - what gear oil goes into the Gear box and differential?

Ive got Caltex Thuban Gear oil EP. SAE 85W - 140 API GL-5. I remember reading something on here about EP meaning Extreme Pressure. This means this oil may have additives that attack Brass??? Is that right?? Are there brass or copper components in either the gearbox or diff in the Chev truck?

Many thanks

G'day Tony,

I would have posted the same question so thanks Tony. When I was towing my Chevrolet into the shed it took a couple of attempts and it was getting dark. So with the truck just a little bit too close to one side of the door frame I took a short cut. Instead of pulling the truck forward - yet again, with Leeann steering the truck while I operated the tractor I did a sideways pull. I figured that the tyres were already stuffed so what could it hurt? The chain must have been pulled against the diff backing plate during the pull. Next morning there was this unique old diff oil smell permeating through the shed and a nice big black pool on my new shed's floor.

Bugger just another thing on the “to do” and “not ever do again” lists. It also joins the “Well it did seem to be a good idea at the time” list too.

Kind Regards
Lionel