MUNCIE METAL TAGS

[mockingbird812]

Calling all trans tag gurus.....(see above). Thanks!

[m22mike]

An anomaly [img]<<GRAEMLIN_URL>>/dunno.gif[/img] why did they bother with a tag for L34 and L78 ? No differance in the M21, right ?

Mike

[mockingbird812]

Mikey, I agree. I don't understand why there would be a different tag (and for that matter the trans construction) for a L34 vs L78 engine in front of an M21. Referenced car is original engine, tranny, and rear with owner history and multiple dealer and factory docs. What could matter (as far as differentiating M21 variants on the assembly line) is the speedo gear wrt the rear axle ratio.

[68z28kk]

There are 3 different speedometer drive gears used on the tail shaft in the muncies. The rear axle ratio will determine which one is used. That is probably why the numbers differ. If a speedo reducer adapter was used that may also reduce the number of different tags that were needed. Here is where I found the information, http://home.comcast.net/~chevelleengineer/speedo.htm it could come in handy. Clint

[Furback]

OK so what is 3968012WM ?

[Steve Shauger]

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Furback</div><div class="ubbcode-body">OK so what is 3968012WM ? </div></div>

I believe its for a 1970 M22 application.

[SS427]

Steve is correct. Pictured is an M22 in a 70 Z28.

[427TJ]

I took this out of my '55. M-21 I think. Looks like a 1970 unit built in October of '69? Anyone help with the decode?

[Stefano]

KA code is 1970 Olds M21.

[XXXGoldL34M20]

Here is mine on my 1970 Chevelle SS 454 LS6 M22