Wouldn't ya know, I just got a 2003 RED GT (my 4th mustang) that only has 5k miles on it and is completely stock :) . Wow, been awhile since I've had a stock stang. Anyways, one of the 1st mods I want to do is get the rear gear changed to a 4.10 and the local tranny shop quoted me "$500-$600"...