getting ready to drop the motor and tranny back into the stang and when starting to install clutch see it does not work.... so im guessing 03 stangs all use a 11 inch clutch not the 10.5 like the 2000 does....
Yes, the transmissions were different between the two years. 2000 used the T-45 (if memory serves correctly...I could be wrong) and the 2003 used the 3650. The switch came in mid-2001.
Just make sure the clutch matches the flywheel and you will be fine. As in, if you have a 11" clutch, get an 11" flywheel. Same trans input spline count, so no issue there.