1967 Muncie ID Tag number?

**Chuck S.** · December 20, 2003, 04:37 PM

Re: 1967 Muncie ID Tag number?

Ken, I can find nothing on either part number in my Corvette parts book, but that doesn't necessarily mean anything; my part book has holes in that it does not show some production part numbers.

I doubt than someone would swap the tags: (1) The transmission is under the car and the tag is not even visible to most buyers, and (2) anyone that would know the tag was there, and wanted to check it, or to check any numbers under the chassis, would be someone who is likely to know what the tag should read. Adding or swapping an incorrect tag would be worse than not having the tag at all in my opinion. No tag means that it may have gotten lost over the years, but an incorrect tag means disception may be in progress, and more attention must be given to the entire car.

Check the number stamped vertically on the right rear of the main case. That number should tell you the assembly date for the transmission (compare with the car build date or the VIN) and the gear ratios (M20, M21, M22). A VIN derivative may also be stamped on 67 transmissions but I am unsure on that.

**Joe C.** · December 20, 2003, 06:05 PM

Re: 1967 Muncie ID Tag number?

Ken:

What is the VIN number of your car. Please tell us the stampings on your transmission, and where they are located. There should be a set on both the driver's and passenger's side vertical flats. At the point where the tail section meets the maincase.

**Ken K.** · December 20, 2003, 06:19 PM

Re: 1967 Muncie ID Tag number?

HERE ARE THE STAMPING NUMBERS ON THE TRANNY. THE DRIVERS SIDE HAS THE CORRECT VIN: 7S111000, AND THE PASS. SIDE IS : P7A30 (1967 JAN 30) THE CAR HAS A BUILD DATE OF FEB. 16
SOMEONE WAS TELLING ME:
"the speedometer gear set installed in the transmission. These were installed at the transmission assembly plant in Muncie, IN, and not at the vehicle assembly plants. So, each different possible speedometer gear set (probably at least 10) times the number of basic trans possibilities (3) gives quite a number of different units which much each be identified by a seperate and distinct part number. ...

Can this part number "3890563" be only for a M21 (L-79) with a 3.55 rear end gear? (to get the correct speedo gear in the tranny)

**William C.** · December 20, 2003, 08:06 PM

Re: 1967 Muncie ID Tag number?

Just out of curiosity, is the trans an M-20 or an M-21? The sales literature for '67 indicates the M-21 was only available with 3.70 and lower (higher numerically) gear ratios.

**Scott C Pfuehler** · December 21, 2003, 08:53 AM

Re: 1967 Muncie ID Tag number?

Ken, look in your 67 Assembly Manual in the back under options, there is a page (maybe coded M20) dedicated to 4 speeds that will list the three 4 speed transmission part numbers and engines they were associated with. The number on your tag should be one of those three choices. Thanks Scott

**Ken K.** · December 21, 2003, 09:31 AM

Re: 1967 Muncie ID Tag number?

O.K., I had no idea if I had a M21 or a M20. I'm pretty sure the rear end is original, stamping "AN2667" (3.55 Posi. Feb. 6th 1967) So.... with this 3.55 rear end and the L79 option, the tranny would have to be a M20!!! Fine, now what does the different tag number that was on the transmission mean. (3890563) It should be a 3870354, correct? Here is a link to a forum a few years back talking about the same thing. Other owners with L79, 3.55 cars have this 3890563 on there cars. Ken

https://www.ncrs.org/forum/archive5.cgi?review=4825

**William C.** · December 21, 2003, 11:02 AM

Re: 1967 Muncie ID Tag number?

I believe your problem is that the list in the AIM is not complete. The 3870354 would have been used with a 3.36 rear end, not a 3.55. the listings all assume the base configuration for the engine combination, and is not complete for all combinations possible. The Base combination for the L-79 with a M-21 is a 3.70 rear axle, which would correspond to the 3880853 number. There was a discussion of this a couple of years ago as to the availability of information for the additional numbers. I don't know if Joe L. had a listing or not, but a search of the archives might yield some information.

**Joe L.** · December 21, 2003, 05:29 PM

Re: 1967 Muncie ID Tag number?

Ken-----

As has been suggested, the list of PRODUCTION part numbers for the transmissions found in the AIM is seriously incomplete and, in some cases, inaccurate. There were MANY more numbers used in PRODUCTION than were shown in the AIM. Also, sometimes the part numbers shown in the AIM for a certain application were also used for other applications. The "controlling factor" was what rear end ratio that the car had and which 4 speed was to be installed (M-20, 21 or 22). Other than the model of the transmission, the installed speedo gear combination was the ONLY difference between these transmissions.

Anyway, GM #3890563 was the PRODUCTION part number for a 1967 M-20 Muncie used with 3.55:1 rear gear ratio. It was used only with L-79 for 1967 Corvettes since the M-20/3.55:1 combination was not used for any other engine option. However, the GM #3890563 was used for other 1967 Chevrolet applications with M-20 and 3.55:1 gears. The GM #3890563 was never available in SERVICE, though.

**Ken K.** · December 21, 2003, 05:47 PM

Re: 1967 Muncie ID Tag number?

Thanks Joe, That sounds like the correct answer. Your the guy!! That information matches my car perfectly. (L79, M20, 3.55:1) Is there a book or website that this information can be found? I'm going through my 1967 and de-coding the numbers, this tag had me stumped.. Thanks again to everyone...
Ken

**Joe L.** · December 21, 2003, 06:59 PM

Re: 1967 Muncie ID Tag number?

Ken----

There is no generally available reference that I am aware of that would have this information.

**Jimmy B.** · December 21, 2003, 07:54 PM

Re: 1967 Muncie ID Tag number?

Ken,

Here's all the numbers off my 67 transmission. The car is a L79 with 3:36 posi. I have the tank sticker & protecto plate. VIN: 194677S114122

MAIN CASE: 3885010 STAMP: P7C08 STAMP: 7S114122
TAIL: 3857584 SIDE COVER: 3884685
METAL TAG: 3870354

My tank sticker says: 02M20AA 4 SPD TRANSMISSION

So I take it I have a M20 wide ratio 4 speed

Jim Blakely

**Craig S.** · December 21, 2003, 09:43 PM

Re: 1967 Muncie ID Tag number?

Ken - my 67 L79 KH vette, built on May 11, 1967 that I had Al Grenning verify the engine pad, and tranny stampings, with a 3.55 rear end, and the M20, has the very same tag as yours, 3890563. This is one off the supposed 564, but now we have two cases of the 563, I always wondered about my tag. Glad yours is the same!.....Craig

**Craig S.** · December 21, 2003, 09:45 PM

Re: 1967 Muncie ID Tag number?

Thx Joe - that matches my 67 L79 3.55 rear tranny tag as well!......Craig

1967 Muncie ID Tag number?

1967 Muncie ID Tag number?

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