Stephen- I'm in the process of collecting parts for the doubler. i just found a donor truck with a TH400/203 combo and want to start looking for a 205. Looking at your web site i'm still unsure as to which one to get. It's going into a K5 so is there different lengths? This will be used as a daily driver will this have any adverse effects on the doubler? and does it use noticaable amounts of horsepower by going through an additional gear box? Sorry for long post. i decieded to post instead of call incase others have the same questions.