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For an approximation of the "feel" of a Muncie shifter place a tire iron in a pail of large rocks.
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Unfortunately, that's an extremely accurate description. I had a '68 Chevelle with the Muncie shifter. Everything said in the previous three postings is true. The 1-2 and 3-4 shifts weren't too bad but the 2-3 shift you could time with a calendar.
I would use the factory shifters for accuracy, but NOT for function or reliability!