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I think I have exactly the same problem with my 4.5, and in my case it can't be the primary fan or fan clutch because I have eliminated those parts and replaced them with an electric fan.
It sounds like a power steering pump that is low on fluid, and the gear whine sound is both intermittent and limited to a rather narrow RPM range that corresponds with 50-60 MPH or so in high gear. But alas I am unable to hear any noise from the pump using a stethoscope when I rev the engine at rest to the requisit RPM. It does seem to be coming from the engine or its accessories, as reving it in neutral while driving produces the same sound.
It's driving me crazy as intermittent problems are inclined to do, so any advise other on the forum have would be much appreciated by me, too.
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Berfinroy in CT
Present vehicles:
1973 300 SEL 4.5
1959 Rolls Royce Silver Cloud I
1959 Ford Thunderbird convertible/430
Past vehicles;
1958 Bentley S 1
1976 ex-Max Hoffman 6.9
1970 300SEL 2.8
1958 Jaguar MK IX
1961 Jaguar MK IX
1963 Jaguar E-type factory special roadster
1948 Plymouth woody
1955 Morgan plus 4
1966 Shelby GT350H Mustang
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