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Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Transmission - Rearend> M21 4 speed speedo gear, which one
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Topic Review (Newest First)
09-24-2007 09:57 PM
jimfulco will help you figure out what combination of gears you need.
09-20-2007 06:58 PM
Deuce 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.
09-20-2007 04:55 PM
M21 4 speed speedo gear, which one

Hi everyone I have a 1980 Z28 M21 4speed with a 3:42 gear 26 inch tires,my question is the speedo gear is all chewed up how do I know which one to replace it with, ex-red blue green?. It came with the red one but I don't know if that is the right one when a 3:42 axle is being used,any experience out there for which colour goes with which rearend would be thankfully received and faithfully applied. thank You

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