Took the 83 D150 for it's voyage run before I get the bodywork/paint done. It is a beast with the 512 I have in it; stays around 180 degrees on the road but builds up to 205 in traffic(may have to put a shroud or electric fan on it) My wife got scared when I nailed it from 55mph and it reached 95 in no time. The problem is the stupid promatic shifter (Mike already identified the problem with his truck) If you start out in 1st and shift through the gears it will reach 3rd but as you cruise it will go back in 2nd or feel like you have the brake on. I have adjusted it as per instructions but it appears that the arm on the tranny could be a little shorter. Has anyone had this problem and contacted Hurst for a resolution? If I had a column shift column I would go that route but I don't.