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I know it's difficult to troubleshoot noises long distance, but I would still appreciate some guidance. The car is a basically stock, (with the exception of an Edelbrock carb & manifold), 68 C-code coupe with the C4 automatic.

The engine runs very quietly, but there is a constant howling / whining noise coming from somewhere behind the engine. It is quite annoying and only becomes bearable at high speeds, probably because it reaches a frequency that I killed by listening to loud rock music in college many, many years ago.

The noise changes frequency with engine speed, and is present in neutral, reverse, and all forward gears. I have changed fluid (using Type F), put in a new filter, and checked fluid level (hot, idling in park).

I have removed the inspection plate, and looked (as best as possible) for signs of flex plate rubbing or any thing else unusual: Nothing obvious.

I am getting used to the idea of doing a trans overhaul (my first) over the winter, but would like some ideas of what might be making this noise, so that I don't miss it. Thanks in advance.

Source: Vintage Mustang Forum