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This transmission is in my 1963. Pretty sure it is not original but hoping somebody could tell me what year it came out of or can you tell if it came out of a corvette? Close ratio? It has a replacement block and if trans is not original either I have no problem putting some upgrades onto the car that are not original. Any help is greatly appreciated.
Serial numbers for Muncie 4-speeds always begin with the letter “P,” which stands for Muncie Plant (not “passenger car.”) “M” and “N” were used to identify 3-speed Muncies; “O” identifies the Saginaw 3-speed with overdrive.
Serial numbers from 1963 to 1966 included only the month and day. For example, P0101 indicates January 1. From 1967 to 1968, the serial number used year, month, and day designators; the month designator is now a letter. For example, the serial number P8A01 is January 1, 1968.
If you have a Muncie dated with a December build date it was actually built the previous year. An example is the date code P8T13. This is for a 1968 production car. The “T” stands for December and 13 is the day.
To confirm this simply look at the VIN. It usually begins with 18S101350 or 28N12950. This means the Muncie was assembled December 13, 1967, for the 1968 model year. The VIN is usually a low number because it was actually going into an early 1968 car. The 1969–1974 Muncies received a ratio designator at the end of the serial number: “A” for M20, “B” for M21, “C” for M22. An example is P2D23B. This is April 23, 1972, M21 ratio. It’s also not uncommon to see double stamps or sometimes even double letters at the end.
Serial numbers for Muncie 4-speeds always begin with the letter “P,” which stands for Muncie Plant (not “passenger car.”) “M” and “N” were used to identify 3-speed Muncies; “O” identifies the Saginaw 3-speed with overdrive.
Serial numbers from 1963 to 1966 included only the month and day. For example, P0101 indicates January 1. From 1967 to 1968, the serial number used year, month, and day designators; the month designator is now a letter. For example, the serial number P8A01 is January 1, 1968.
If you have a Muncie dated with a December build date it was actually built the previous year. An example is the date code P8T13. This is for a 1968 production car. The “T” stands for December and 13 is the day.
To confirm this simply look at the VIN. It usually begins with 18S101350 or 28N12950. This means the Muncie was assembled December 13, 1967, for the 1968 model year. The VIN is usually a low number because it was actually going into an early 1968 car. The 1969–1974 Muncies received a ratio designator at the end of the serial number: “A” for M20, “B” for M21, “C” for M22. An example is P2D23B. This is April 23, 1972, M21 ratio. It’s also not uncommon to see double stamps or sometimes even double letters at the end.
The date code, NOT, repeat, NOT the serial number is what begins with the P.!!!
I clicked on the posted link and scrolled down to where an explanation was given about the serial number beginning with a P on Muncies.
This a profound example of why I do not place much (or none) credence in articles such as that one!!!!!!!!f
Consequently, this just demonstrates how MANY, MANY, MANY mistakes, errors, misrepresentations are conceived and continually propagated in the automotive world (as well as other areas of society). I've observed over many years that frequently people who write these articles have either piggy backed off of other inaccuracies, do not proof what they have written before being published, or just do not research the subject matter before making public their lack of knowledge of the subject matter.
The P9H10A (as mentioned) does translate to 1969, June(NOT Aug) 10, and the A(as mentioned) denotes an M20(wide ratio). ON MUNCIE 4spds, the year in the date code (in this case 9) does NOT necessarily indicate the year of assembly of the transmission-----------------------IT INDICATES THE YEAR MODEL OF CAR IT WAS INSTALLED IN. In this case, it came from a 69 model car.
The STAMPED partial VIN appears to be 3197359070, but I'm not 100% sure, so I'm not going to expand much on it.
The first number usually indicates the car division it came from:
1=Chev
2=Pont
3=Olds
4= Buick
Thus, it looks as if that Muncie came out of an Olds (maybe 442???????).
The third digit is the year model of the car (9=1969).
The 4th digit (looks like a 7????) typically is a LETTER which indicates the assembly plant where the tranny was installed in the vehicle. For a Corvette (built at St. Louis), that digit would be an S.
Again, I'm not 100% positive of that stamped partial VIN.
The casting number on the main case, 3925660 was used in 68-69 cars. Thus, that fits for a 1969 car from which it was originally installed.
The tail housing casting number, 3857584 was used on 65-70 Muncies.
Bottom line, it ain't a 63 Muncie! (a 69 Muncie is a better tranny than a 63 Muncie)
My next question is, what bell housing is in the car? The bell housing used in 63 cars is unique and ONE YEAR only (a 660 case is NOT compatible with a 63 bell housing).
I would add one thing to Tom's excellent explanation. The fourth character of the VIN derivative is a "Z" indicating the car assembly plant. The "Z" designates the Fremont plant, which built A bodies in 1969 including the Olds Cutlass/442. Tom is correct - you have a transmission that was originally installed in a 1969 Olds Cutlass or 442 built at the Fremont, California plant.
I would add one thing to Tom's excellent explanation. The fourth character of the VIN derivative is a "Z" indicating the car assembly plant. The "Z" designates the Fremont plant, which built A bodies in 1969 including the Olds Cutlass/442. Tom is correct - you have a transmission that was originally installed in a 1969 Olds Cutlass or 442 built at the Fremont, California plant.
OOOOOOOOOOOK, that explains that! It's a Z instead of a 7. I just could not tell from the picture.
The three digits in front of the plant designation was bothering me, usually there were only two - the car division and the year. I went to the ChevelleStuff website and found an engine stamp on a '69 Chevelle 396 just 10 units in front of the OP's transmission stamp. It has the same light lower end of the 9 and the same large Z, leading me to believe the OP's transmission stamp may be from a Chevelle built at Fremont. Why the 3's are there is anyone's guess. I worked at the Fremont Plant ('65 - '82) and know engine stamps did not get the scrutiny they get today.
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The first pic is the OP's turned right-side-up. The second pic is the Chevelle 396 just 10 jobs ahead of it on the line. You be the judge?
02-18-2019, 03:04 PM
Muncie Trans numbers?
