Actually, depending on year, your stock rear was either a 2.73 (94-98 3.8) or 3.27 (99-04 3.8). All mach 1s have a 3.55 ratio.
Hope that helps
2002 Mineral grey GT 5 speed. Flowmaster 40's catback, Mach 1 grille delete, timing advance, push button starter, Bullitt pedals, FR500 steering wheel, K&N FIPK, Self ported upper intake w/ spacer, Pioneer Avic D3, MGW shifter, MM FL subframe connectors, Mach 1 springs, Bilstein HD struts/springs