Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - M21 4 speed speedo gear, which one
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Old 09-20-2007, 07:58 PM
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You must know which gear is on the output shaft ... to find the correct one that you need ...

Note the above is NOT a Muncie but does show the relationship of the gears ...

Go here ... for a on-line calculator ... but you must know the gear number on the output shaft.
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