Mixing GL-5 differential oils

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This sounds like a dumb question considering I've done this with engine oil. My logic has always been if the engine is a quart low on oil and requires say 10W30, as long as you add something (example: 1 quart of 20W50) , that's better than running one low on oil.

I've got several leftover quarts of GL-5 from various cars I own.

One maintenance item left to do on my van is change the the differential fluid. I don't think it requires anything special. I had a 1996 Ford Explorer which had this mechanical AWD system where they took two limited slip differentials and mounted a transfer case between them. The rear required a synthetic lube + some additive from the Ford dealership.

If I had a quart of say 75W90, 80W/90, etc and mix them together, is this OK?

I also have some Royal Purple leftover from my Explorer. Can I mix this stuff with regular gear oil?

I mean as long as all of them are rated at GL-5?
 
While looking for partial containers of automatic transmission fluid I found the following:

Napa brand 80W90
Advance Auto 75W90
Royal Purple 75W90.
Lucas Oil stabilizer

I think I have enough to do the differential.
 
DO NOT use any Lucas Oil stabilizer as it does not have any GL-5 chemistry.

You want all GL-5 rated lubes for a differential requiring a 75W90 grade lube.

You can mix the other three to get the fill you need.
 
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