P51C

Do ya know that? You're the one who claimed the rear gears were helical, which they aren't and now, it looks like you aren't reading my posts either, in that some light noise is to be expected from a mechanical gearbox.

You're tossing out gear names like a stick, trying to find a dog that'll hunt. Spur gears are found in cars on tiny parts like WP, oil pump drives, etc. so, aren't used much and aren't a source of much racket.

Have a crack at convincing Ford that any degree of trans whine isn't normal for one of these cars, even if it sounds like a supercharger. It's pretty fun, I assure you.

Helical gears, which, btw, look like this: /// are about as quiet as gears tend to get. It's certainly not for added strength that they are in gearboxes, as straight cut gears have that covered. They are there because they can be made strong enough and they don't make alot of racket.