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this is a few years ago but coming back to update so other's can benefit.
the issue was the size of the steel ball that sits inside of the reverse switch in the gear box. who would've thought that a previous owner made this mistake or perhaps some other reason.
afteri bought the new ball, i took the old on and it was very clear the new one was much bigger. install new ball and old switch... all working perfect. that only took me a few years to bother fixing.