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m22 how to tell from m21?

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#15

04-09-2008, 07:17 AM

Z28DZ

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Re: m22 how to tell from m21?

[ QUOTE ]
any truth to a drain plug being a idenifier? dennis

[/ QUOTE ]

Sort of. M22 did have the drain plug, however many M20/21's had a drain plug retrofitted for ease of gear lube changes.

Here's a pic of the gear sets showing the teeth angles:

M20/21:

M22:

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