My ST has the 318 5spd and had been a great basic truck so far. The 5-speed helps with the gas mileage and avoids some of the nasty transmission problems with the Dodge automatics. I too have the spark knock on heavy acceleration with load, which can be improved with premium fuel every now and then. This is a solid no frills truck with 160K on it and likley many more good KM to go.
Heavy duty build (compared to my 95 Ford f150) 5-speed 318 and the looks