There are a few reasons your transmission might be making a chirping noise. It could be that the torque converter is going out, the input shaft bearing is failing, or there's an issue with the transmission pump. Let's take a closer look at each of these possibilities.
The torque converter is what transfers power from the engine to the transmission. If it's going bad, you'll likely hear a chirping noise when the car is in gear and being driven. The input shaft bearing is located between the engine and transmission and helps support the weight of the input shaft. If it's failing, you'll hear a chirping noise when shifting gears or when driving at high speeds.
Lastly, there could be an issue with the transmission pump. The pump helps circulate fluid throughout the system and keeps everything lubricated. If it's not working properly, you may hear a chirping noise as well as notice other symptoms like hard shifting or leaks.
If your car is making a chirping noise, it's best to have it checked out by a professional mechanic to diagnose the problem and get it repaired before it leads to further damage down the road.