What are the common issues in the transmission system of an Audi 80?

I've noticed some strange noises and a delay in gear shifting in my Audi 80. What could be the potential causes and how can I troubleshoot them?

The most common issue in the transmission system of Audi 80 is the failure of the solenoid or valve body. This can be diagnosed by performing a diagnostic scan of the vehicle.

Another possible cause could be a clogged transmission filter. In such cases, it is recommended to replace the filter and do a complete transmission flush.

If the problem persists, it could be due to a faulty torque converter. This will require a complete replacement and reprogramming of the transmission module.