They are a lot of fun since you can split all the gears not just an overdrive. Be prepared to modify the tunnel. They told me about a half inch. I had to cut out the tunnel and raise it two inches.
Old Man Ray: If you happen to have a moment, could you elaborate on what all you had to do with modifying the tunnel? I'm not overly experienced with doing these things so if I'm going to have to cut things out, I might have to re-think buying one of these units. What car did you add your OD unit to? The car I'm thinking about putting it into is a 74 Duster (225). Many thanks to you!!!