Torque converter going out?

[umsomtimes]

Yesterday after I left the car wash and started driving to the beach for my boss' retirement party I started hearing this noise if I give the car over half throttle in first gear from a stoplight or any kind of stop. It also doesn't it in neutral. If I just ease the throttle It doesn't make any noise but if I give it more than half throttle i get the noise around 2000 RPMS I have a 98' trans am A4 that's pretty much stock except for the zr1 wheels and a volant intake with ram air hood

[umsomtimes]

Or maybe the air conditioner clutch