m-20 questions - Team Camaro Tech
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post #1 of 4 (permalink) Old Jan 30th, 00, 06:13 PM Thread Starter
 
Join Date: Jan 2000
Location: elyria,ohio
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What are some of the differences between the M-20,M-21,M-22?Will M-20 hold up to power of a 427?
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post #2 of 4 (permalink) Old Jan 30th, 00, 07:12 PM
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muncie 4-speeds are very tough,all should work well with a 427.The m22 "rockcrusher" is the strongest of them all.The m22"s gears are cut different and causes the trans.to make a wining noise.Without digging out my refrence books ,I beleive the major difference between the m20 and m21 is the m20 is a "wide ratio" 4-speed and the m21 is a "close ratio" 4-speed.There maybe some other differences but I don't remember one trans. being stronger than the other.I hope this answers your question

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post #3 of 4 (permalink) Old Jan 31st, 00, 09:46 AM
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Location: Meridian, Idaho
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Go to http://www.gearzone.net
Has good information and codes on Muncies.

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70 Z/28
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post #4 of 4 (permalink) Old Jan 31st, 00, 10:07 AM
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The m-22 muncie from what I understand is the strongest of the 3. With the m-21 or m-22 you will need at least a 3.73 ratio in your rear end or you tear out the clutch in a short time

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