Ford makes approximately 45,000 Mustang GTs a year. About 40% of these have 5-speeds. The T3650 started in 2001 model years... so we're talking about 3yrs * 45,000 cars * 40%, or 54,000 cars. Add in the Mach 1s, Bullitts, and Cobras and you probably have 70,000 cars, total. This is not 100,000...