When my car is in fourth or fifth gear I can hear a “whiring” noise that I believe is coming from the transmission. In first, second and third gears all I hear is exhaust from the factory five pipes. It’s not a whine but a lower pitched noise. 30 years ago I had a car with an M22 transmission and gear and Sychro whine was a welcome sound as it was normal. I have no experience until last May driving with a T5 transmission. I am just wondering if I’m hearing normal transmission noise or if it’s the sound of a problem. To put this in perspective, we are talking about doing 65 on the highway and I can hear this low pitched whine/whir. The T5 is out of the donor car a 1990 Mustang LX with 69,000 miles on it.