Re: MUNCIE METAL TAG ID
 

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Lynn</div><div class="ubbcode-body">From the assy manual for 1969 Camaro (don't know about Chevelle or 67-68 Camaro)

3950356 is for RPO M20 with L48, L34, L35, LM1
3946797 is for RPO M20 with Z28 &amp; L78
3950316 is for RPO M21 with L34
3946798 is for RPO M21 with Z28 and L78
3950318 is for RPO M22 with Z28 and L78

Evidently, from this and from the RPO spreadsheet file in pdf available at camros.org, you could not order a close ratio (M21 or M22) unless you had L34 (M21 only) or Z/28 or L78.

Now, for another question: Why is there a different tag number for the M20 behind a Z/28 or L78 as opposed to the one behind an L48 engine? They would be identical outside dimensions. The Z and the L48 would have identical shifters and brackets. Was there anything internally different between a Z/28 M20 and the regular small block SS M20? There had to be something different about these transmissions to warrant different tags. Maybe the standard rear gear ratio? </div></div>I don't think they had identical shifters.I don't think they had identical shifters. One would have had a Hurst and the other a Muncie.

Re: MUNCIE METAL TAG ID
 

All the four speeds in 69 got the hurst shifter.

I believe the answer to the question was submitted by crash: &quot;Different speedo gears on the main shaft...&quot; Crash

The Z and L78 would likely have the lower rear axle dictating different speedo gears to at least get close on the speedo.

Re: MUNCIE METAL TAG ID
 

12B641197 Thanks.

Re: MUNCIE METAL TAG ID
 

I noticed above that &quot;<span style="font-style: italic"><span style="font-weight: bold"><span style="font-size: 11pt">3950316</span></span> is for RPO M21 with L34</span>&quot; but I have the same tag on an M21 for a low mile L78 (4.10 rear) car. Would that be possible?

Re: MUNCIE METAL TAG ID
 

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

Re: MUNCIE METAL TAG ID
 

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

Re: MUNCIE METAL TAG ID
 

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.

Re: MUNCIE METAL TAG ID
 

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

Re: MUNCIE METAL TAG ID
 

OK so what is 3968012WM ?

Re: MUNCIE METAL TAG ID
 

<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.

Re: MUNCIE METAL TAGS
 

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

Re: MUNCIE METAL TAGS
 

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?

http://i12.photobucket.com/albums/a2...ps6596727b.jpg

http://i12.photobucket.com/albums/a2...psccbb0cc4.jpg

http://i12.photobucket.com/albums/a2...psc848bf7a.jpg

http://i12.photobucket.com/albums/a2...ps0752e3ae.jpg

http://i12.photobucket.com/albums/a2...psd5500f07.jpg

Re: MUNCIE METAL TAG ID
 

I have M22 CT 10 spline and 27 spline. The tag on it is 3968012WM. Chevelle is 26 spline input in 1970? Or just LS6 cars? Is this correct? And mine is tagged for 1970 Other cars with M22?

Re: MUNCIE METAL TAG ID
 

Furback, 3968012 WM Transmission tag was used on 70 Camaro and Corvette M22 applications. It was a 10 spline input with a 27 spline mainshaft.
70 Chevelle with a 454 engine used a 3978766 WO coded Trans which is the 26 spline input with a 32 spline mainshaft for the M22 that they used. This was for both ls6 and ls5.
Chris

Re: MUNCIE METAL TAGS
 

KA code is 1970 Olds M21.

Re: MUNCIE METAL TAGS
 

Here is mine on my 1970 Chevelle SS 454 LS6 M22

Re: MUNCIE METAL TAGS
 

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Stefano</div><div class="ubbcode-body">KA code is 1970 Olds M21. </div></div>

Thanks Stefano.

Re: MUNCIE METAL TAGS
 

Here's a few I've saved over the years.

Re: MUNCIE METAL TAGS
 

Matt -- just a few, huh?

Re: MUNCIE METAL TAGS
 

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: earntaz</div><div class="ubbcode-body">Matt -- just a few, huh? </div></div>

I had another cup full of them somewhere but I can't find them at the moment.

Re: MUNCIE METAL TAGS
 

Nice collection. Care to sell the WO tag in the upper right corner? PM me if you would.

Re: MUNCIE METAL TAGS
 

Matt,
Tag, you're it. [img]<<GRAEMLIN_URL>>/crazy.gif[/img]

Re: MUNCIE METAL TAGS
 

Pun intended..... [img]<<GRAEMLIN_URL>>/wink.gif[/img]

Re: MUNCIE METAL TAGS
 

Anyone have a 'WM' tag to sell like Rick posted at the top of page 6 for a 1970 M22? Or where to get a good reproduction tag?

Re: MUNCIE METAL TAGS
 

Does anyone know what application for Muncie assembly 3880853 would fit? My tranny has this tag number.

Thanks, Paul

Re: MUNCIE METAL TAGS
 

67 m21 corvette

Re: MUNCIE METAL TAGS
 

Wow my 70 chevelle L78 was built at the kanzas city plant with a vin number 127777 I almost swallowed my tounge thought it was mine. Then I noticed it was 112777 so close EH
Pj

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: 427TJ</div><div class="ubbcode-body">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?

http://i12.photobucket.com/albums/a2...ps6596727b.jpg

http://i12.photobucket.com/albums/a2...psccbb0cc4.jpg

http://i12.photobucket.com/albums/a2...psc848bf7a.jpg

http://i12.photobucket.com/albums/a2...ps0752e3ae.jpg

http://i12.photobucket.com/albums/a2...psd5500f07.jpg </div></div>

Re: MUNCIE METAL TAGS
 

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: P.J.</div><div class="ubbcode-body">Wow my 70 chevelle L78 was built at the kanzas city plant with a vin number 127777 I almost swallowed my tounge thought it was mine. Then I noticed it was 112777 so close EH
Pj

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: 427TJ</div><div class="ubbcode-body">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?</div></div> </div></div>

I would have cut you a sweet deal had it been out of your car.

I just purchased a L35 68 Camaro with that tag (077) last night. So its for a 68 Camaro 396ci 325hp with 307 posi and M20 Wide Ratio Trans.

Old Thread but hope this helps....Dave

I know this is an older thread, but my new ‘67 Chevelle SS L78 came with an M20....I didn’t realize the M21 was even available, and I was too naive honestly to know the difference! But, it’s now obvious to me that without spec’ing the M21 on the order the factory put the M20 into the build as the standard 4 speed. Car was an absolute rocket regardless and I never had any issues with the M20. I’d probably opt for the M21 given the chance to go back in time! Still miss the car to this day! Hardly ever see a Deepwater Blue Metallic ‘67 Chevelle these days! Been looking for it for many years!

Posting From Dale's Site
 

With Dale's permission, I am posting a link to his older site with a multitude of information on Transmissions and tags. Most tag information at the bottom of the page. Hope this helps:
http://chevellestuff.net/qd/muncie.htm

Paul

3950318 XH. late 69 M22?

It's listed on the first 69 internal code list to come out May of 68.