MUNCIE METAL TAGS

[427king]

Can anyone tell me where i can find nfo for decoding metal 4 speed tags for muncie m20 21 and 22. I have 40 or 50 of those metal tags from mostly 69 and 1970 and would like to decipher some of them.

[Lynn]

3950356 is for RPO M20 with L48, L34, L35, LM1
3946797 is for RPO M20 with Z28 & L78
3946798 is for RPO M21 with Z28 and L78
3950318 is for RPO m22 with Z28 and L78

I believe this info is according to the AIM for 1969 models.

Lynn

[427king]

Thanks ...Any info on decoding the 2 letter codes [ie WO for 70 chevelle m22 etc that are at the end of the part #] ?

[Lynn]

Don't know about 70's, but I bet someone here does.

[mockingbird812]

Mr70 knows this stuff. Hey Rick! http://www.yenko.net/ubbthreads/images/graemlins/wink.gif

[427king]

actually im looking for that 2 letter code and part #s info for 69 as well as 70...

[Mr70]

Lots of people contributed,but credit goes to Chuck Hanson for publishing this all in last months Chevelle World.Box #28 on the Buildsheet will reflect the 2 letter code as well.
<u>Muncie ID Tags</u>
1964 M20 3841435
1965 M20 3857577
1965 M20 3857578 Z16
1966 M20 3870357 L-34 L-35
1966 M20 3890534 L-78
1966 M21 3877459 ALL
1966 M22 3879993 L-78
1967 M20 3870357 L-34 L-35 L-79
1967 M21 3877459 ALL
1967 M22 3879993 L-78
1968 M20 3915079 L-34 L-36 L-78 L-79
1968 M21 3915085 L-34 L-36 L-78 L-79
1968 M22 3925626 L-78
1969 M20 3950301 L-48 L-35
1969 M20 3946767 L-34 L-78
1969 M21 3946798 ALL
1969 M22 3950318 L-78 COPO L72
1970 M20 3952659 WB
1970 M21 3968012 (disc.3-11-70)
1970 M21 3968011 WL
1970 M22 3978766 WO
1971 M20 3974484 WN
1971 M22 3978766 WO
1972 M20 3974484 WN
1972 M22 6271517 WJ

[427king]

Thanks.

[crash]

In the past 6 months or so I've had several 1969 Chevelle people asking me for tag #3946767 for an L-78 application... I don't have this tag and have never seen one... If you go to Camaro assembly manual the tag for L-78 is 3946797... My question is does anyone have a 3946767 tag, or have they seen one??? Or my thought is that it's a typo and the 9 got flipped in the printing process to become a 6... These tags are usually in familyies of tag numbers...
3946797
3946798
3946799
I have never seen any tag number either side of 3946767...
I'm open to any and all input... Crash

[Kurt S]

Hate to say, but Chuck's list has several errors in it. Also, note that Chevelle and Camaro shared some applications, but some were unique.

Crash,
The 767 # is one of the errors.

[P.J.]

Kurt
Please correct the errors so that we can all get it straight
thanks
PJ

[Kurt S]

I'll try, but it's not happening soon....
Not an easy topic and I have enough pet projects.

[Mr70]

I agree with the 6767 issue,all Chevrolet materials I've seen report it should be a 9.
I have two actual 9 tags here as well.
I can not confirm if this typo was made by the author of the list or the source he got it from,but it does look like an error.

[Stefano]

[ QUOTE ]
Lots of people contributed,but credit goes to Chuck Hanson for publishing this all in last months Chevelle World.Box #28 on the Buildsheet will reflect the 2 letter code as well.
<u>Muncie ID Tags</u>

1964 M20 3841435
1965 M20 3857577
1965 M20 3857578 Z16
1966 M20 3870357 L-34 L-35
1966 M20 3890534 L-78
1966 M21 3877459 ALL
1966 M22 3879993 L-78
1967 M20 3870357 L-34 L-35 L-79
1967 M21 3877459 ALL
1967 M22 3879993 L-78
1968 M20 3915079 L-34 L-36 L-78 L-79
1968 M21 3915085 L-34 L-36 L-78 L-79
1968 M22 3925626 L-78
1969 M20 3950301 L-48 L-35
1969 M20 3946767 L-34 L-78
1969 M21 3946798 ALL
1969 M22 3950318 L-78 COPO L72
1970 M20 3952659 WB
1970 M21 3968012 (disc.3-11-70)
1970 M21 3968011 WL
1970 M22 3978766 WO
1971 M20 3974484 WN
1971 M22 3978766 WO
1972 M20 3974484 WN
1972 M22 6271517 WJ

[/ QUOTE ]

I have a low mileage, very original 1966 SS Impala 327/275 hp 4 speed car, built the third week in October which has a 3870372 tag. Can anyone confim the application?

[bkhpah]

1969 M22 tag from Ed Ernsts COPO..BKH
http://i61.photobucket.com/albums/h50/bkhpah/DSC04299.jpg

[Mr70]

Stefano
Take this with a grain of salt as my records are not as complete as others.
I'm finding the Muncie M-20 #3870372 was installed behind the 1966-67 396cid &amp; 427cid vehicles only.
It also shows when the 1966 Passenger series got a 327cid,it got Muncie M-20 #3884603 (Not used behind L-79).
A friend of mine who owns a 1967 327cid Passenger series has an M-20 w/#3916108 tag on it.
I'm sure crash could help narrow this down some more.

[westonz28rs]

How about this tag number 3964502? Was in the bucket that held a CE stamped muncie m 20 all there but in many pieces. Thank you for the information.

[Mr70]

That's a Muncie 4spd. 2:52:1 ratio used originally in:
1968 Passenger series w/396cid &amp; 427cid.
1968 Camaro,Chevy II w/327cid &amp; 350cic &amp; 396cid.

And recommended replacement in:
1967 Camaro 350cid &amp; 396cid.
1966-68 Chevelle,Camaro 327cid.
1965-67 Passenger series.
1966 Chevy II.
1965 Chevelle,Chevy II.

[Chevy2]

Well, while were at it whats this # 3915077

[Mr70]

That's a Muncie 4spd. wide ratio 2:52:1 as well.
Used originally in:
*1968 Passenger series w/8.15 X 15 tires w/3:55 axle AND when 396cid or 427cid. equipped.
*1968 Corvette w/o Posi or 3:55 axle.

And Recommended replacement in:
*1965-67 Passenger &amp; Corvettes when NOT close ratio equipped.
*1965 Corvette w/o Spcl. Hi-Perf or Fi.

It was soon superceded in 1970 by Muncie #3964507 for same applications.

[MR-427]

I also have a 3915077 and 3867268..I havent a clue what either is..I believe the 3867268 tag was from a 1968 m-21

[Mr.Nickey Nova]

[ QUOTE ]
Lots of people contributed,but credit goes to Chuck Hanson for publishing this all in last months Chevelle World.Box #28 on the Buildsheet will reflect the 2 letter code as well.
<u>Muncie ID Tags</u>
1964 M20 3841435
1965 M20 3857577
1965 M20 3857578 Z16
1966 M20 3870357 L-34 L-35
1966 M20 3890534 L-78
1966 M21 3877459 ALL
1966 M22 3879993 L-78
1967 M20 3870357 L-34 L-35 L-79
1967 M21 3877459 ALL
1967 M22 3879993 L-78
1968 M20 3915079 L-34 L-36 L-78 L-79
1968 M21 3915085 L-34 L-36 L-78 L-79
1968 M22 3925626 L-78
1969 M20 3950301 L-48 L-35
1969 M20 3946767 L-34 L-78
1969 M21 3946798 ALL
1969 M22 3950318 L-78 COPO L72
1970 M20 3952659 WB
1970 M21 3968012 (disc.3-11-70)
1970 M21 3968011 WL
1970 M22 3978766 WO
1971 M20 3974484 WN
1971 M22 3978766 WO
1972 M20 3974484 WN
1972 M22 6271517 WJ

[/ QUOTE ]
Rick,I take it that these are for Chevelles only.I have a 3968011WL on my Nova that is a M21.Could this number been used on other cars also in 1970.

[Mr70]

Although printed in a Chevelle themed publication,those are not Chevelle specific.
Yes,other vehicles shared them.

[COPO CARTEL]

For what it's worth if anyone has a 3950318 I would be interested in purchasing one. Thanks Doug

[jamesholden]

have a 3946797 tag. original. M20
not typo

james
530.941.4399

[Lynn]

[ QUOTE ]
have a 3946797 tag. original. M20
not typo

james
530.941.4399

[/ QUOTE ]

That is what my M-20 has. I beleive that is correct for 69 Camaro with Z/28 or L78.

[crash]

Tag Number 3946767 in the list from the Chevelle report is wrong, should be 3946797... Crash

[Mr70]

I do believe you're right,but it's in A.C.E.S. Chevelle World magazine.

[luv2sixty9]

The 3946797 is for the 1969 M20 Trans. I'm looking for 3946798 if anyone has an extra.

[Lynn]

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?

[crash]

Different speedo gears on the main shaft... Crash

[hubleyman]

So after reading this topic of discussion, I decide to go out in the garage and check out the tag for my 69 Z/28 and see if it has that 3946797 tag that is being discussed...

Mind you, this Muncie is the matching number gearbox for my car but has been sitting under a workbench for 15 + years (my buddy who used to own the car broke one of the mounting ears). I've never bothered to look at it other than to make sure the VIN was correct....

Low and behold, here's a pic of what I found....

Charlie

[Lynn]

Nice! You didn't even know you had a rock crusher? Can you post a pic of the assembly date code?

[hubleyman]

Oh sure, make me get my hands dirty.......

Well, with a little help from some carb cleaner, here you go.......

FYI, my car is a 10A Norwood built Camaro so I think that is before they started stamping the extra trany code letter on the case??? Probably why I never bothered to open the side cover and check it out? Looks like I have a new task to do this weekend....

[Charley Lillard]

Or save yourself the time and effort and give me the Z28..

[hubleyman]

I'd be happy to Charley.... but it was dirty last time I had it out it wouldn't go to well with the others in your Harem....

[Charley Lillard]

Perfect..and it is already on the trailer..Your only about 70 miles away. You could have it here saturday.

[acicoria1]

I have one I have been trying badly to decode: M20 with an assembly code of P2C29A. Has the 26 spline in and 32 out, drain plug, case #3925661, tail #3978764, and side cover #3952648. Everything seems to indicate it came in an 1972 BB Chevelle. The metal tag on the side cover is: 6271516WD. I am confident that it is correct for the trans. I have had it since 1980 and I know it has not been touched and the metal tag has stayed intact. Would love to know how to decode this metal tag. Any help would be appreciated!
PS. tried to upload a pic of it but do not know how. Clicked on &quot;enter an image&quot; but it's asking for a ULR. Does that mean I have to put the pic on a page to add? -Technology passes us all by sooner or later...

[Igosplut]

I have a dog food can full of these, perhaps I should check them...

[Fast67VelleN2O]

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: acicoria1</div><div class="ubbcode-body">I have one I have been trying badly to decode: M20 with an assembly code of P2C29A. Has the 26 spline in and 32 out, drain plug, case #3925661, tail #3978764, and side cover #3952648. Everything seems to indicate it came in an 1972 BB Chevelle. The metal tag on the side cover is: 6271516WD. I am confident that it is correct for the trans. I have had it since 1980 and I know it has not been touched and the metal tag has stayed intact. Would love to know how to decode this metal tag. Any help would be appreciated!
PS. tried to upload a pic of it but do not know how. Clicked on &quot;enter an image&quot; but it's asking for a ULR. Does that mean I have to put the pic on a page to add? -Technology passes us all by sooner or later... </div></div>

What is the vin stamped next to the assembly date?

<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.

[Lynn]

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.

[acicoria1]

12B641197 Thanks.

[mockingbird812]

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?

[mockingbird812]

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

[m22mike]

An anomaly <<GRAEMLIN_URL>>/dunno.gif 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?

http://i12.photobucket.com/albums/a234/BE427TJ/M-21d_zps6596727b.jpg (http://s12.photobucket.com/user/BE427TJ/media/M-21d_zps6596727b.jpg.html)

http://i12.photobucket.com/albums/a234/BE427TJ/M-213925661_zpsccbb0cc4.jpg (http://s12.photobucket.com/user/BE427TJ/media/M-213925661_zpsccbb0cc4.jpg.html)

http://i12.photobucket.com/albums/a234/BE427TJ/M-213907112777_zpsc848bf7a.jpg (http://s12.photobucket.com/user/BE427TJ/media/M-213907112777_zpsc848bf7a.jpg.html)

http://i12.photobucket.com/albums/a234/BE427TJ/M-21POR09AB_zps0752e3ae.jpg (http://s12.photobucket.com/user/BE427TJ/media/M-21POR09AB_zps0752e3ae.jpg.html)

http://i12.photobucket.com/albums/a234/BE427TJ/M-21tag_zpsd5500f07.jpg (http://s12.photobucket.com/user/BE427TJ/media/M-21tag_zpsd5500f07.jpg.html)

[Furback]

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?

[Ls6 Ragtop]

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

[Stefano]

KA code is 1970 Olds M21.

[XXXGoldL34M20]

Here is mine on my 1970 Chevelle SS 454 LS6 M22

[427TJ]

<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.

[Fast67VelleN2O]

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

[earntaz]

Matt -- just a few, huh?

[Fast67VelleN2O]

<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.

[SS427]

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

[Rixls6]

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

[SS427]

Pun intended..... <<GRAEMLIN_URL>>/wink.gif

[MN 70L78]

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?

[Hotrodpaul]

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

Thanks, Paul

[Enoch]

67 m21 corvette

[P.J.]

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/a234/BE427TJ/M-21d_zps6596727b.jpg (http://s12.photobucket.com/user/BE427TJ/media/M-21d_zps6596727b.jpg.html)

http://i12.photobucket.com/albums/a234/BE427TJ/M-213925661_zpsccbb0cc4.jpg (http://s12.photobucket.com/user/BE427TJ/media/M-213925661_zpsccbb0cc4.jpg.html)

http://i12.photobucket.com/albums/a234/BE427TJ/M-213907112777_zpsc848bf7a.jpg (http://s12.photobucket.com/user/BE427TJ/media/M-213907112777_zpsc848bf7a.jpg.html)

http://i12.photobucket.com/albums/a234/BE427TJ/M-21POR09AB_zps0752e3ae.jpg (http://s12.photobucket.com/user/BE427TJ/media/M-21POR09AB_zps0752e3ae.jpg.html)

http://i12.photobucket.com/albums/a234/BE427TJ/M-21tag_zpsd5500f07.jpg (http://s12.photobucket.com/user/BE427TJ/media/M-21tag_zpsd5500f07.jpg.html) </div></div>

[427TJ]

<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.

[luv2sixty9]

Well, while were at it whats this # 3915077

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

[Chevelle SS 396 L78]

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!

[fsc66]

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

[the427king]

3950318 XH. late 69 M22?

[TAR6569]

3950318 XH. late 69 M22?

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