I'm afraid I can offer no assistance but maybe sooner or later someone can. We have some extremely smart people here. My only thought about something "squealing" makes me think a belt is slipping...

and of course the movie Deliverance

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Nello Tare

1982 300D (266,001 mi.) looking and running great

Previously owned:
1976 450 SLC
1983 300D
1976 300D
also
1982 Jaguar XJ6 (loved, but gone)