m22 how to tell from m21?

**wheelhop** · #1 04-09-2008, 04:33 AM

Ct. ???? huh, isn't that where 427King lives????

**427king** · #2 04-09-2008, 04:34 AM

[ QUOTE ]
Ct. ???? huh, isn't that where 427King lives????

[/ QUOTE ] Yeah, but he said "real good price" so that eliminates me as the seller

**wheelhop** · #3 04-09-2008, 04:35 AM

I was thinking that but couldn't say it!!!!

vettem · #4 04-09-2008, 04:47 AM

would you one sell for 1200.?(rebuilt)

**427king** · #5 04-09-2008, 04:58 AM

[ QUOTE ]
would you one sell for 1200.?(rebuilt)

[/ QUOTE ] Keep an eye on the parts for sale section, there are some serious deals on some real rare and desirable stuff coming up real soon. You may be amazed.

396/425blr · #6 04-09-2008, 06:29 AM

any truth to a drain plug being a idenifier? dennis

crash · #7 04-09-2008, 07:04 AM

The begining of the 1970 model year engineering drawing changed to put a fill and drain plug in every main case...
A lot of customer what drain plugs, so I have drilled and tapped many cases to 1/2" NPT, and I know a lot of rebuilder that do the same...
The only positive way of determining if you have and M-22 is to pull the side cover to see if the gears helical angle is 21* (M-22) or 39* (M-20-21)... Hope this helps... Crash

Z28DZ · #8 04-09-2008, 07:17 AM

[ 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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