Hey Zimona, one thing about the 3.73s on the 99/00 model stangs is you will have to get either a computer chip or a compensator in order to get your speedometer to read correctly. You speedo will be about 10mph fast when you first get the gears installed until you get the compensator. I bought the Abbott Compensator which cost $120. You can order it from Houston Performance (www.houstonperformance.com)....Hope this info gets to you in time so you will be able to get it done right the 1st time.
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1999 Mustang GT 35th Anniversary Edition - FMS 3.73s, Abbott Compensator, Steeda Tri-Ax Shifter, K&N Air Filter, Air Silencer Removed, Rear Bumper Inserts
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