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Since I am seriously considering the 3.73 gear for my Bullitt, I called the local Ford dealer to price the install. The technician I spoke to said that as part of the install, they install either a Dallas Mustang or Abbott Racing speedometer box, which corrects your speedo after the gear swap. Anybody here have experience with this "box"? I am wondering if it is really required and how far off would the speedo be if I chose not to install it.
This Ford dealer quoted me 600.00 for everything.
This Ford dealer quoted me 600.00 for everything.