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Author Topic: Muncie metal trim tag identification  (Read 21029 times)

Dave O.

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Muncie metal trim tag identification
« on: November 17, 2016, 04:12:04 PM »
Is there Muncie metal trim tag information for Camaro's and what do the numbers mean?
Thanks, Dave O.
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bertfam

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Re: Muncie metal trim tag identification
« Reply #1 on: November 17, 2016, 04:24:08 PM »
Quote
Is there Muncie metal trim tag information for Camaro's and what do the numbers mean?

Dave, there was a tag attached to the transmission, but it was just the part number for the transmission. Here's an example (tag attached to the bottom left bolt of the cover)

Ed
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Mike S

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Re: Muncie metal trim tag identification
« Reply #2 on: November 17, 2016, 04:43:30 PM »
 I believe that P/N is also reflected in the AIM.

Mike
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jdv69z

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Re: Muncie metal trim tag identification
« Reply #3 on: November 17, 2016, 04:48:07 PM »
Close up of mine.
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Jimmy V.

bertfam

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Re: Muncie metal trim tag identification
« Reply #4 on: November 17, 2016, 04:51:56 PM »
Dave, I just went back and re-read your question, and we may be reading it wrong. Are you asking if there's a physical tag attached to the transmission or are you asking if there's any information on the TRIM TAG showing proof that a Muncie transmission was originally installed in the car??

Ed
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69Z28-RS

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Re: Muncie metal trim tag identification
« Reply #5 on: November 18, 2016, 03:27:51 AM »
Quote from: Dave O. on November 17, 2016, 04:12:04 PM
Is there Muncie metal trim tag information for Camaro's and what do the numbers mean?
Thanks, Dave O.

If you are talking about the numbers on the small metal tag attached to Muncies, then the number is the GM/Chevy PN for the transmission; there are different numbers for each transmission (M20, M21, M22), and probably for each year produced (although I'm not certain of that and haven't seen a complete list of those PNs)...
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ZLP955

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Re: Muncie metal trim tag identification
« Reply #6 on: November 18, 2016, 04:10:17 AM »
I looked into decoding these a while back, and it seemed the Muncie tag number was dependant on groups of diff ratios, as well as the Muncie type (M20,M21 and M22). Will have to dig out my notes on observations of original drivetrain cars and the AIM info.
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jdv69z

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Re: Muncie metal trim tag identification
« Reply #7 on: November 18, 2016, 02:20:55 PM »
Yes, that would have to be the case. Any difference between two Muncies, even if just one part, (like a speedo gear for a given ration) would require a unique part number.
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Jimmy V.

Dave O.

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Re: Muncie metal trim tag identification
« Reply #8 on: December 06, 2016, 05:40:50 PM »
Sorry guys I've been gone out of state helping my 86 year old dad with some issues. Thanks for your responses! Yes, I was talking about the stamped metal tag the you showed in the picture and what do they mean. Like trans type, car type, year, rear gear type, etc.
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ko-lek-tor

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Re: Muncie metal trim tag identification
« Reply #9 on: December 06, 2016, 06:35:21 PM »
Quote from: Dave O. on December 06, 2016, 05:40:50 PM
...Yes, I was talking about the stamped metal tag the you showed in the picture and what do they mean. (?) Like trans type, car type, year, rear gear type, etc. (?) A: Yes
The AIM lists what these tag numbers are and hints to their application. This is in M20/A1 of the AIM.
As I understand, the M20 & M21 have 2 numbers based on rear gear ratios that changed the speedometer gears with ratios of 3.55 and lower (higher numerically) using the one assigned to the Z28,L78. The L6-production v8 is a Saginaw M20 (1st number), next number is a Saginaw. Then, next 2 M20 Muncie, then 2 M21 (close ratio) and lastly M22.

So, the 376, 378, are Saginaws, 356 & 797 are M20 w/356 higher than 3.55 rear ratio (IE 3.31), 797 3.55 & lower. Then, 316 & 798 M21. Again, 316 higher ratio than 3.55, 798 3.55 & lower. Then last, M22.
The reason that these are assigned to different RPOs is based on these RPO default ratios. A L48 M20, I assume, with an optional rear ratio of  4.10 would get the 797 trans.
If this information I provided is wrong, then it will be corrected.
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z28z11

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Re: Muncie metal trim tag identification
« Reply #10 on: December 07, 2016, 04:33:36 AM »
Shot of my X77's tag. I need to crawl under the '68 and get a shot of the M21's tag on it. Not the '68's original, but an original Norwood '68 trans by the VIN number (probably need to post the VIN in the Orphans section at the same time !)

Regards,
Steve
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bcmiller

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Re: Muncie metal trim tag identification
« Reply #11 on: December 07, 2016, 01:23:44 PM »
Steve, yes please post it in the Orphans section when you have time.
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rare396bronze

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Re: Muncie metal trim tag identification
« Reply #12 on: December 08, 2016, 05:03:37 AM »
Yes there is different speedo gear's used. Get the tag# off your transmission. Also get the numbers that are stamped  in to your main case. If should be on the right side for Camaro or on top or the drivers side depending what kind off car it came off. If it is a 68 up trans it will have a partial vin on it.
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bcmiller

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Re: Muncie metal trim tag identification
« Reply #13 on: December 08, 2016, 06:38:04 AM »
Most Muncies will have a partial VIN - if originally installed in a car at the assembly plant. This is true even in 1967 and earlier model years.
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Bryon / 1968 Camaro SS 396 coupe - now old school 468 big block
1967 Camaro RS/SS 396 coupe L35/M40 - 4 generation family project
Looking for 68 Camaro with body # NOR 181016

Dave O.

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Re: Muncie metal trim tag identification
« Reply #14 on: December 08, 2016, 04:48:05 PM »
Thanks ko-lek-tor and Steve for the pictures and info. I just got a AIM book and the M20 A1 page looks a little different from yours. Is that's because of different issues and or change in information?
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