What gear oil should i use in Differential axle housing?

72 mercury cougar


351c fmx tranny


should i use 85w-140


or 80w-90What gear oil should i use in Differential axle housing?
80W-90.What gear oil should i use in Differential axle housing?
go to local advance parts, or auto zone store they can look it up in there computer and tell you the type, but most likeky it is 80/90 or 85/140 gear oil good luck
If its worn I would use 85w-140 and if its fairly rebuilt/new I would use the 80w-90 and finally, I would look at the books for this model and see what they recommend.
You should be using a premium SAE 80W-90 rear axle lubricant.
80w90 GL5. the 15 140 is too heavy for that gearbox.
80-90
80w90.
when i had a rear wheel drive i used 90 weight gear oil.