rear axle fluid type

[laborboy@xxxxxxxxxx]

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the manual specifies API GL-4 for my 8.75 rear end (64 Dodge big block). 
I bought some Castro Hypo fluid that rates GL-5. Can I use that? Or must 
I use only GL-4. The Coastal brand advertised for GL-5, 4 and 3?

Any thoughts?

Zack

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