Originally Posted by 52vff
So, since there's no Tractor Supply north of the border I'll have to source some proper oil then. Suggestions for alternatives appreciated.
Would this oil be better for the vacuum 2speed rear too?

I found this Motul product works OK in my 1967 SM420. Bought it at the local auto parts store.
Gear oil

Gord 🇨🇦
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1954 1/2 ton 235 4 speed