I've seen speedo's jerk around pretty spastically, but that is usually the result of the cable sticking.
I can't see how anything could be bad inside the transmission--it's just two gears, either they are working or the aren't--so to me that only leaves the speedometer itself. Anybody have a better guess?
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66 GT Fastback 5.0, 5-speed, cable clutch, JBA's, 3.40 gears, EFI coming soon?
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