86 Nissan 300zx turbo humming very loudly after fast ride?

Title, i recently had to go like 80+ on a highway, which i try not to do to not put stress on it, but i had to, and afterwards it was humming very loudly. Like it's taking a huge breath or something. So i got home parked. Next morning turn on hoping it solves itself, it's still loud. I recently got the transmission fluid pumps replaced if that is a reason? Idk it just sounds like im revving the engine when im barely moving. Thanks for any help