Got my 3.73's and a/d intstalled today and I like it!! Since it revs a bit faster it just seems smoother coming out of the hole. The shop that did the install had about five cars lined up to do gears (two T/A's a camaro and two stangs) Gears are a big part of their business. The guy darn near talked me in to a Vortech, but I will need to save a little for that one. However, there was a guy with a GT there that had the Vortech SQ on it and man it is sweet. I am socking the change away for sure now.