94 Infiniti G20t transmission squeak

I noticed this morning that my 1994 Infiniti G20t was making a squeak when in 1st and/or 2nd gear when accelerating, but not consistently or constantly. When I open the window I can’t hear it, but when the window is closed I can hear it. It lasts a second or two when it does happen. What do you think it could be? I looked to see if anything was hanging down/stuck in the wheel or anything like that.

Automatic or manual transmission?  Does it do it more when turning left or right?

It’s a manual transmission. It does it when going straight, turning left, or turning right. It never does it when going over 5mph. Thanks.