So I decided to drain and fill the ATF fluid until it finally came out clear.
Driven the car for about 250 miles to make sure the Torque Converter shudder wouldn't get worse, as I plan on replacing the trans in Miami. Wanted to make sure it was up for the drive. Well, unfortunately, but fortunately the TC Shudder is to the point where the car lacks acceleration due to the TC issue.
The vibration is significantly worse, and glad it happened here. This is why I drove the vehicle non-stop as much possible. The SX4 is still drive-able, however not for long trips. Will need to replace the trans, which fortunately is not very expensive for a decent used one.
