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Not a question, I was answering Packard V8. I simply use this hill as reference. If it slowed to say 35 mph then I know there is a problem, 40 mph at the top is good for this hill and this car which is a 633 sedan with a non standard 4.3 : 1 diff.

I also have a brass era veteran that struggles to hold top gear and slows to about 10 mph on thee same hill.