I too have the march to groove underdrive pulley as well. I used it when I had the electric water pump and all I ran was the alternator. My stock one was too fast and like I said I wouldn't make it past 2nd gear and the thing would fly off! Align my pulleys up with a 3ft metal straight edge. They're spot-on and my belts are tight and new. Anyways I thought that hundred $70 setup looked kind of slick and light and direct. Once everything gets to be just so you start looking for stuff to spend your money on LOL...