Here are the results of my trip to the bank:
I went 45 in 4th, couldn't hear it over my exhaust, shift to 5th and I heard it, but nowhere near as loud as last night. This leads me to believe it is my tires, it was nice the past couple weeks so I put my summer wheels and tires on, but last night it was really cold out, probably 25-30. I have NT555 tires (summer only tires), so could the cold weather cause something like this to happen? Oh and it is 45 and sunny today.