JackTripper

How much of the VIN number should be stamped on the transmission housing on a 1965?

Was it only stamped in one location? Please post a picture if you can.

1965 L76 Built in June 65.

tuxnharley

It should be "S" followed by the last 6 digits of the VIN (sequential assembly number), located on the main case.

midyear

here is mine, its an early 65 L76

JackTripper

Okay. So no "year" stamp like on the 67's correct?

So if my VIN is 194675S123456, then the vin on the Transmission should read "S123456" on a 1965 correct?

midyear

correct, but there is a date stamp on the trans as well, its on the other side of the trans. my date on mine shows it was made Aug 14th 1964

tuxnharley

Yes to your second point.

Re your first point, up thru '64 the first digit of the VIN stamp was the model year instead of the plant, so it would have started with a "4" for a '64, etc.

I'm not sure I understand your reference to the '67. The VIN stamp on a '67 Muncie would be the same protocol as for a '65. Both - in fact all Muncies - also use a date code for when the case was cast. Its a circle bisected horizontally, with the upper sector being a month code 1 - 12 (January being 1) and the bottom sector being a week of the month code represented by a number of dots, 1-5.

JodysTransmissions

I've seen many fake assembly "P" restamps due to guys not understanding the cast date system of these two round circles!

I am not referring to your Muncie "midyear", just stating a fact for educational purposes.

JackTripper

Regarding the 67's I saw some pics online that had the "7" in front of the S123456..... 7S123456. I read that this was only for 67 and not 65. I just want to confirm.

tuxnharley

I dunno - that's news to me. The Muncie isn't in my '67 anymore - it's been replaced by a Tremec 5 spd and now is in a crate in storage buried under a bunch of other stuff.

However, IIRC (and its been about 7 years since I looked at it.............) There was not a "7" in front of the VIN on it.

Hopefully others with more recent experience can weigh in on this.

Velox

Actually, for 1967 trans, there is. The NCRS Judging Guide states "The stamping consists of the model year (7), followed by an S (St. Louis plant), followed by a 1 (placeholder) and finally five digits representing the last five digits of the car's VIN." My car trans photo below

JackTripper

Is there a placeholder for the 65?

Velox

And just FYI for those interested in 67 4-speed stampings, the assembly code was also different. The JG states "The stamping consists of a single letter indicating the source plant (P=4 speed built at Muncie), a "7" for the model year, a letter indicating month, and two digits indicating day of the month. If a shift code is present, the stamping will end with a D (day shift) or N (night shift). Month codes are January=A, February=B, March=C, April=D, May=E, June=H, July=K, August=M, Sept=P, October=R, November=S and December=T." Mine below April 3 1967

Velox

Yes. The '65 Muncie did not have the year stamped, just the S then the 1 (placeholder) then the 5 digits for VIN (as in the photo of the 65 trans earlier in this thread)

JackTripper

Thank you sir.

1snake

Not 100% accurate. On the NCRS site, John Hinckley posted - The transmission was VIN-stamped right after it was bolted to the engine, early on the Engine Dress Line; until about November, the same gang-holder was used for the VIN derivative on both the engine pad and the transmission. In November, the format for the transmission stamp changed ("S" replaced the leading "5"), so there were two different gang holders for the rest of the model year.

On mine, they must have grabbed the wrong gang holder and stamped it with the engine pad one and then hand stamped a "S" over the 5.

warrenmj

Isn't there also a number designating what type of car the Muncie was installed in? I replaced my Muncie with a Tremec about 8 yrs ago and when I researched all the numbers, I found it came out of a '69 or '70 Firebird, so I sold it instead of storing it. I don't recall all the numbers, but it was pretty clear my Trans wasn't original to my '66 and came from a firebird.

orlandjoe

Here's my M21 which I replaced with a Tremec 5 speed in 2005.

65hihp

Your 1965 Muncie was an M20, not M21.

JackTripper

I see. Not available in 65'.

http://www.vettefacts.com/C2/1965.aspx

tuxnharley

My understanding is that all 4 spds in '65 were designated as M20s. The internal gear ratios varied and were determined by what rear axle ratio the car was ordered with. The wide ratio gears came with the lower rear ratios (3.08, 3.36, etc) and the close ratio gears came with the higher rears (4.11, 4.56, etc).

The separate designation for M20 and M21 (and for M22 for that matter as well) did not start until 1966.