I have a code, shift solenoid 3 but the transmission shop will only replace the transmission.

I was driving down the street and my engine made a loud noise and started smoking and overheating. I only had the car for 4months and its leaking dark fluid. I don't know if its the transmission or the head gasket but its still starts after sitting for a while. I'm confused and don't know what to do or why it happened.

Took to the Dodge dealer twice, they told me because of the way the motor sits it can make a noise when going from one reverse or drive. They adjusted the motor mounts.

The problem is still there.