The days of having over heating , etc are long gone. Convertors have come a long way as long as you have everything else in place. I have a 6400 convertor in mine with a 2 speed and it behaves and drives perfect in traffic and highway , 4.3 rear gears . If l want it to stand out then you can with short shift into 2nd gear but otherwise no issues . BM cooler with its own electric fan mounted on it never goes over 160.