I've got a Richmond 6 speed in my 76 so if I can adapt it to a Mustang II you should be able to get it into just about anything. A tad pricey of course but then again so is the viper trans. I've also see a brand C 6 speed box in a stang so there are options. All it comes down to is how much skill or money you have to make it happen.
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74-78 MustangII's So many II's so Little Time.
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