It kind of sounds like your spedo cable might be the cause. If it sounds like there are birds living insinde your dashboard. Especially when its cold. The progression from soft and barely noticeable to ludicrusly loud takes about 5000 miles.
One way to test this is jack your front driver side wheel up off the ground and secure it with jack stand put it in first and let the wheel spin. Listen for the squeek next to the wheel.
Then listen inside the car. If the noise is loud inside and almost non audible outside next to the wheel. Your spedo cable is going out. Buy new one for $25 and install.
The transmittion side is easy the dash side requires a removal and reinstall. Might as well put white gauges on while your in there.
Hope this helps