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What brand and weight of gear oil can I use in an 8 inch open rear end that would reduce noise the greatest? Do others experience rear end whine in an early Mustang?
 

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It looks like someone might have run it low or out of oil at some point. I run basic gear oil in my Falcon and Red Line Synthetic in my truck. The Red Line is a superior lubricant, so maybe you want to try it. But, my guess is you are a candidate for a good used 8" pumpkin. I run a 9" and got a VERY NICE (low wear) open 3.50 pumpkin for $90. An 8" could be cheaper. The good news is you can go to a different gear ratio really cheap
 
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