I am ready to do a gear swap in my 2000 GT 'vert. Please don't tell me to go 4.10's- ain't gonna happen. I'm almost ready to order 3.73's but I'm still considering 3.55's. I do not go to the track but I love spirited acceleration. Has anybody had 3.55's and 3.73's in the same car? Which did you prefer? I just want to make sure 3.73's aren't too drastic. I probable drive 70% highway, 30% town. Can the speedo be corrected by Ford by changing a value in the computer or does it have to be a speed cal?