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#306322 - 04/13/08 02:32 AM MUNCIE METAL TAGS
427king Offline
Carpal Tunnel

Registered: 08/15/06
Posts: 3139
Loc: Graceland
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.

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#306323 - 04/13/08 02:58 AM Re: MUNCIE METAL TAGS [Re: 427king]
Lynn Offline

Pooh-Bah

Registered: 02/22/05
Posts: 2299
Loc: Oklahoma
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


Edited by Lynn (04/13/08 03:05 AM)

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#306324 - 04/13/08 02:59 AM Re: MUNCIE METAL TAGS [Re: Lynn]
427king Offline
Carpal Tunnel

Registered: 08/15/06
Posts: 3139
Loc: Graceland
Thanks ...Any info on decoding the 2 letter codes [ie WO for 70 chevelle m22 etc that are at the end of the part #] ?

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#306325 - 04/13/08 03:06 AM Re: MUNCIE METAL TAGS [Re: 427king]
Lynn Offline

Pooh-Bah

Registered: 02/22/05
Posts: 2299
Loc: Oklahoma
Don't know about 70's, but I bet someone here does.

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#306326 - 04/13/08 03:08 AM Re: MUNCIE METAL TAGS [Re: Lynn]
mockingbird812 Offline

Carpal Tunnel

Registered: 06/04/04
Posts: 10632
Loc: Dayton and Phoenix
Mr70 knows this stuff. Hey Rick!
_________________________
Sam


With your chrome heart shining in the sun...
Long may you run!


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#306327 - 04/13/08 03:11 AM Re: MUNCIE METAL TAGS [Re: Lynn]
427king Offline
Carpal Tunnel

Registered: 08/15/06
Posts: 3139
Loc: Graceland
actually im looking for that 2 letter code and part #s info for 69 as well as 70...

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#306328 - 04/13/08 03:17 AM Re: MUNCIE METAL TAG ID [Re: 427king]
Mr70 Offline

Carpal Tunnel

Registered: 01/27/01
Posts: 14580
Loc: Illinois
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.
Muncie ID Tags
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


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#306329 - 04/13/08 03:25 AM Re: MUNCIE METAL TAG ID [Re: Mr70]
427king Offline
Carpal Tunnel

Registered: 08/15/06
Posts: 3139
Loc: Graceland
Thanks.

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#306330 - 04/13/08 05:06 PM Re: MUNCIE METAL TAG ID [Re: Mr70]
crash Offline

addict

Registered: 04/01/02
Posts: 420
Loc: Kenosha, Wi.
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

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#306331 - 04/13/08 09:04 PM Re: MUNCIE METAL TAG ID [Re: crash]
Kurt S Offline
Pooh-Bah

Registered: 08/01/00
Posts: 1613
Loc: Ann Arbor, MI
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.
_________________________
Kurt S - CRG

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#306332 - 04/14/08 01:32 PM Re: MUNCIE METAL TAG ID [Re: Kurt S]
P.J. Offline

veteran

Registered: 05/09/04
Posts: 1205
Loc: Ontario Canada
Kurt
Please correct the errors so that we can all get it straight
thanks
PJ

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#306333 - 04/15/08 04:22 AM Re: MUNCIE METAL TAG ID [Re: P.J.]
Kurt S Offline
Pooh-Bah

Registered: 08/01/00
Posts: 1613
Loc: Ann Arbor, MI
I'll try, but it's not happening soon....
Not an easy topic and I have enough pet projects.
_________________________
Kurt S - CRG

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#306334 - 04/15/08 01:47 PM Re: MUNCIE METAL TAG ID [Re: crash]
Mr70 Offline

Carpal Tunnel

Registered: 01/27/01
Posts: 14580
Loc: Illinois
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.

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#306335 - 04/16/08 01:12 AM Re: MUNCIE METAL TAG ID [Re: Mr70]
Stefano Offline


Carpal Tunnel

Registered: 10/06/01
Posts: 6320
Loc: Land of Lincoln
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.
Muncie ID Tags

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





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?
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#306336 - 04/16/08 02:00 AM Re: MUNCIE METAL TAG ID [Re: Stefano]
bkhpah Offline

Carpal Tunnel

Registered: 03/30/00
Posts: 4904
Loc: Latrobe, PA
1969 M22 tag from Ed Ernsts COPO..BKH


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#306337 - 04/16/08 09:33 PM Re: MUNCIE METAL TAG ID [Re: Stefano]
Mr70 Offline

Carpal Tunnel

Registered: 01/27/01
Posts: 14580
Loc: Illinois
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 & 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.

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#306338 - 05/02/08 03:13 PM Re: MUNCIE METAL TAG ID [Re: Mr70]
westonz28rs Offline
newbie

Registered: 01/11/04
Posts: 3
Loc: Idaho, USA
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.
_________________________
1966 Buick Special Convertible 1967 Camaro RS L30/M20 1968 Camaro Coupe 1969 Camaro RS LM1

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#306339 - 05/02/08 03:34 PM Re: MUNCIE METAL TAG ID [Re: westonz28rs]
Mr70 Offline

Carpal Tunnel

Registered: 01/27/01
Posts: 14580
Loc: Illinois
That's a Muncie 4spd. 2:52:1 ratio used originally in:
1968 Passenger series w/396cid & 427cid.
1968 Camaro,Chevy II w/327cid & 350cic & 396cid.

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


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#306340 - 05/02/08 06:18 PM Re: MUNCIE METAL TAG ID [Re: Mr70]
Chevy2 Offline
newbie

Registered: 03/14/08
Posts: 17
Loc: NE
Well, while were at it whats this # 3915077

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#306341 - 05/04/08 02:17 PM Re: MUNCIE METAL TAG ID [Re: Chevy2]
Mr70 Offline

Carpal Tunnel

Registered: 01/27/01
Posts: 14580
Loc: Illinois
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 & 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.

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#306342 - 08/10/09 11:03 PM Re: MUNCIE METAL TAG ID [Re: Chevy2]
MR-427 Offline

addict

Registered: 03/14/08
Posts: 408
Loc: CONNECTICUT
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

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#306343 - 08/12/09 12:07 AM Re: MUNCIE METAL TAG ID [Re: Mr70]
Mr.Nickey Nova Offline
addict

Registered: 01/14/08
Posts: 517
Loc: Chicago Suburbs
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.
Muncie ID Tags
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




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.

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#306344 - 08/12/09 02:19 AM Re: MUNCIE METAL TAG ID [Re: Mr.Nickey Nova]
Mr70 Offline

Carpal Tunnel

Registered: 01/27/01
Posts: 14580
Loc: Illinois
Although printed in a Chevelle themed publication,those are not Chevelle specific.
Yes,other vehicles shared them.

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#306345 - 08/12/09 02:24 AM Re: MUNCIE METAL TAG ID [Re: Mr70]
C O P O CARTEL Offline

old hand

Registered: 10/21/05
Posts: 902
Loc: Columbus Ohio
For what it's worth if anyone has a 3950318 I would be interested in purchasing one. Thanks Doug
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#306346 - 02/09/10 05:10 AM Re: MUNCIE METAL TAG ID [Re: C O P O CARTEL]
jamesholden Offline
newbie

Registered: 02/09/10
Posts: 1
Loc: shasta lake,ca
have a 3946797 tag. original. M20
not typo

james
530.941.4399

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#306347 - 02/09/10 12:56 PM Re: MUNCIE METAL TAG ID [Re: jamesholden]
Lynn Offline

Pooh-Bah

Registered: 02/22/05
Posts: 2299
Loc: Oklahoma
Quote:

have a 3946797 tag. original. M20
not typo

james
530.941.4399




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

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#306348 - 02/09/10 04:30 PM Re: MUNCIE METAL TAG ID [Re: Lynn]
crash Offline

addict

Registered: 04/01/02
Posts: 420
Loc: Kenosha, Wi.
Tag Number 3946767 in the list from the Chevelle report is wrong, should be 3946797... Crash

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#306349 - 02/09/10 05:59 PM Re: MUNCIE METAL TAG ID [Re: crash]
Mr70 Offline

Carpal Tunnel

Registered: 01/27/01
Posts: 14580
Loc: Illinois
I do believe you're right,but it's in A.C.E.S. Chevelle World magazine.

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#306350 - 02/23/10 06:55 PM Re: MUNCIE METAL TAG ID [Re: Mr70]
luv2sixty9 Offline

member

Registered: 03/30/07
Posts: 158
Loc: Pennsylvania
The 3946797 is for the 1969 M20 Trans. I'm looking for 3946798 if anyone has an extra.
_________________________
67 Z/28 Butternut Yellow
69 Z/28 Rally Green
69 Z11 Pace Car
(2) 69 RS/Z28 Lemans Blue / Olympic Gold
2010 2SS RS Aqua Blue

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#306351 - 02/24/10 01:43 AM Re: MUNCIE METAL TAG ID [Re: luv2sixty9]
Lynn Offline

Pooh-Bah

Registered: 02/22/05
Posts: 2299
Loc: Oklahoma
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 & 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?

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#306352 - 02/24/10 01:54 AM Re: MUNCIE METAL TAG ID [Re: Lynn]
crash Offline

addict

Registered: 04/01/02
Posts: 420
Loc: Kenosha, Wi.
Different speedo gears on the main shaft... Crash

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#306353 - 02/26/10 12:49 AM Re: MUNCIE METAL TAG ID [Re: crash]
hubleyman Offline

member

Registered: 05/16/06
Posts: 195
Loc: Petaluma, Ca
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


Attachments
446206-Blue69Ztranytag.JPG (169 downloads)


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#306354 - 02/26/10 12:54 AM Re: MUNCIE METAL TAG ID [Re: hubleyman]
Lynn Offline

Pooh-Bah

Registered: 02/22/05
Posts: 2299
Loc: Oklahoma
Nice! You didn't even know you had a rock crusher? Can you post a pic of the assembly date code?

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#306355 - 02/26/10 01:10 AM Re: MUNCIE METAL TAG ID [Re: Lynn]
hubleyman Offline

member

Registered: 05/16/06
Posts: 195
Loc: Petaluma, Ca
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....


Attachments
446209-blue69Ztranyassydate.JPG (133 downloads)


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#306356 - 02/26/10 01:46 AM Re: MUNCIE METAL TAG ID [Re: hubleyman]
Charley Lillard Offline


Carpal Tunnel

Registered: 04/10/00
Posts: 11856
Loc: Woodland, ca. US
Or save yourself the time and effort and give me the Z28..

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#306357 - 02/26/10 01:52 AM Re: MUNCIE METAL TAG ID [Re: Charley Lillard]
hubleyman Offline

member

Registered: 05/16/06
Posts: 195
Loc: Petaluma, Ca
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....


Attachments
446217-blu69Zrearshot.JPG (104 downloads)


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#306358 - 02/26/10 02:20 AM Re: MUNCIE METAL TAG ID [Re: hubleyman]
Charley Lillard Offline


Carpal Tunnel

Registered: 04/10/00
Posts: 11856
Loc: Woodland, ca. US
Perfect..and it is already on the trailer..Your only about 70 miles away. You could have it here saturday.
_________________________
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#517836 - 02/18/13 05:18 PM Re: MUNCIE METAL TAG ID [Re: Mr.Nickey Nova]
acicoria1 Offline
newbie

Registered: 12/23/11
Posts: 6
Loc: Homosassa, Florida
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 "enter an image" 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...
_________________________
1969 RS 427 COPO tribute.
1969 SS/RS 396 4 speed
1971 coupe TH350 4 Seasons A/C second owner

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#517859 - 02/18/13 07:51 PM Re: MUNCIE METAL TAG ID [Re: 427king]
Igosplut Offline

member

Registered: 12/27/06
Posts: 166
Loc: Cape Cod Ma.
I have a dog food can full of these, perhaps I should check them...
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WOT

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#517872 - 02/18/13 08:43 PM Re: MUNCIE METAL TAG ID [Re: acicoria1]
Fast67VelleN2O Offline

Carpal Tunnel

Registered: 03/12/07
Posts: 3053
Loc: South Jersey
Originally Posted By: 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 "enter an image" 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...


What is the vin stamped next to the assembly date?
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EBAY Auctions

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#517890 - 02/18/13 10:48 PM Re: MUNCIE METAL TAG ID [Re: Lynn]
frankk Offline

enthusiast

Registered: 01/19/05
Posts: 322
Loc: Prince George.B.C.
Originally Posted By: 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 & 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?
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.

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#517898 - 02/18/13 11:21 PM Re: MUNCIE METAL TAG ID [Re: 427king]
Lynn Offline

Pooh-Bah

Registered: 02/22/05
Posts: 2299
Loc: Oklahoma
All the four speeds in 69 got the hurst shifter.

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

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

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#518156 - 02/20/13 07:14 PM Re: MUNCIE METAL TAG ID [Re: Fast67VelleN2O]
acicoria1 Offline
newbie

Registered: 12/23/11
Posts: 6
Loc: Homosassa, Florida
12B641197 Thanks.
_________________________
1969 RS 427 COPO tribute.
1969 SS/RS 396 4 speed
1971 coupe TH350 4 Seasons A/C second owner

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#538208 - 08/20/13 03:56 PM Re: MUNCIE METAL TAG ID [Re: 427king]
mockingbird812 Offline

Carpal Tunnel

Registered: 06/04/04
Posts: 10632
Loc: Dayton and Phoenix
I noticed above that "3950316 is for RPO M21 with L34" but I have the same tag on an M21 for a low mile L78 (4.10 rear) car. Would that be possible?


Edited by mockingbird812 (08/20/13 03:57 PM)
_________________________
Sam


With your chrome heart shining in the sun...
Long may you run!


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#538271 - 08/21/13 09:16 AM Re: MUNCIE METAL TAG ID [Re: 427king]
mockingbird812 Offline

Carpal Tunnel

Registered: 06/04/04
Posts: 10632
Loc: Dayton and Phoenix
Calling all trans tag gurus.....(see above). Thanks!
_________________________
Sam


With your chrome heart shining in the sun...
Long may you run!


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#538306 - 08/21/13 01:18 PM Re: MUNCIE METAL TAG ID [Re: mockingbird812]
m22mike Offline

Carpal Tunnel

Registered: 01/10/06
Posts: 2693
Loc: West of CAK
An anomaly dunno why did they bother with a tag for L34 and L78 ? No differance in the M21, right ?

Mike
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13.50 @ 103 SCR XIII
13.45 @ 105 National Trails, last pass B4 the axle broke

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#538307 - 08/21/13 01:26 PM Re: MUNCIE METAL TAG ID [Re: 427king]
mockingbird812 Offline

Carpal Tunnel

Registered: 06/04/04
Posts: 10632
Loc: Dayton and Phoenix
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.
_________________________
Sam


With your chrome heart shining in the sun...
Long may you run!


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#538317 - 08/21/13 02:36 PM Re: MUNCIE METAL TAG ID [Re: 427king]
68z28kk Offline

journeyman

Registered: 07/22/07
Posts: 85
Loc: near kansas speedway
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

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#563629 - 03/17/14 03:35 PM Re: MUNCIE METAL TAG ID [Re: 427king]
Furback Offline

novice

Registered: 02/20/13
Posts: 43
Loc: New Brunswick Canada
OK so what is 3968012WM ?
_________________________
1968 Nova SS
1971 Nova SS
1970 Camaro SS
1975 Trans Am
1970 Challenger R/T

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#563646 - 03/17/14 05:21 PM Re: MUNCIE METAL TAG ID [Re: Furback]
paceme Offline


Pooh-Bah

Registered: 08/23/00
Posts: 1973
Loc: Long Island, NY
Originally Posted By: Furback
OK so what is 3968012WM ?


I believe its for a 1970 M22 application.
_________________________
Steve Shauger
Vintage Certification™ , Providing Recognition to Unrestored Muscle Cars. Website: www.vintagecertification.com

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#563653 - 03/17/14 06:16 PM Re: MUNCIE METAL TAGS [Re: 427king]
SS427 Offline

Carpal Tunnel

Registered: 07/26/01
Posts: 6602
Loc: Pleasant Plains, IL
Steve is correct. Pictured is an M22 in a 70 Z28.


Attachments
tn_IMG_9449.JPG

tn_IMG_9448.JPG


_________________________
Musclecar Restoration and Design, Inc
www.musclecarrestorationanddesign.com
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specializing in LS6 Chevelle restorations









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#563661 - 03/17/14 07:24 PM Re: MUNCIE METAL TAGS [Re: 427king]
427TJ Offline
Carpal Tunnel

Registered: 01/05/04
Posts: 4351
Loc: PNW
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?









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#563671 - 03/17/14 08:01 PM Re: MUNCIE METAL TAG ID [Re: 427king]
Furback Offline

novice

Registered: 02/20/13
Posts: 43
Loc: New Brunswick Canada
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?
_________________________
1968 Nova SS
1971 Nova SS
1970 Camaro SS
1975 Trans Am
1970 Challenger R/T

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#563700 - 03/18/14 12:32 AM Re: MUNCIE METAL TAG ID [Re: 427king]
Ls6 Ragtop Offline

enthusiast

Registered: 11/08/07
Posts: 276
Loc: MA
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

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#563714 - 03/18/14 09:26 AM Re: MUNCIE METAL TAGS [Re: 427TJ]
Stefano Offline


Carpal Tunnel

Registered: 10/06/01
Posts: 6320
Loc: Land of Lincoln
KA code is 1970 Olds M21.
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#563722 - 03/18/14 10:49 AM Re: MUNCIE METAL TAGS [Re: Stefano]
XXXBlackLs6M22 Offline

veteran

Registered: 12/21/09
Posts: 1221
Loc: Ontario Canada
Here is mine on my 1970 Chevelle SS 454 LS6 M22


Attachments
Trans Muncie Tag.JPG


_________________________
1970 Chevelle SS454 LS6 M22 19-B Black
http://tripleblack1970chevelless454ls6.shutterfly.com/

1970 Challenger R/T S.E.440 4Spd FY1
http://1970challengerrtse440ucode.shutterfly.com/

1970 Chevelle SS Group
https://www.facebook.com/groups/330902645844/

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#563729 - 03/18/14 11:57 AM Re: MUNCIE METAL TAGS [Re: Stefano]
427TJ Offline
Carpal Tunnel

Registered: 01/05/04
Posts: 4351
Loc: PNW
Originally Posted By: Stefano
KA code is 1970 Olds M21.


Thanks Stefano.
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