What causes the engine to whine?

[Demolisher_1]

I upgraded my '70 Challenger, but the roar of the engine and exhaust is being drowned out by a horrible whine. What causes it?

 

[onearmbandit]

Changed the trans as well huh...

 

[mulholland]

transmission, or supercharger. straight cut gears spinning that fast make some serious wailing. look up some youtube vids

 

[Demolisher_1]

transmission, or supercharger. straight cut gears spinning that fast make some serious wailing. look up some youtube vids

Ok, thanks!