I HAVE A 1968 400 MATCHING NUMBER CAR BUT THERE IS NO VIN STAMP
ON THE TRANS ANY WERE .I BROUGHT THE CAR FROM THE ORIGINAL OWNER
HE SAID THAT IS THE ORIGINAL DEARBORN THAT CAME WITH THE CAR.
IS IT POSSIBLE THAT THEY DID NOT STAMP THE TRANS. ANYONE COME
ACROSS THIS PROBLEM.THANKS ALL

I'd bet it's there, just real hard to find/see. The muncies were stamped near the mid plate across the top if memory serves.

From Hemmings:
 

TRANSMISSIONS
While every other Firebird used a Saginaw three-speed manual as a base transmission, the Firebird 400 used a heavy-duty Dearborn three-speed with a 2.42:1 first gear ratio, sourced from Ford Motor Company. The optional Muncie M20 four-speed manual also backed both the 326 and 326 H.O.-powered Firebirds for that year. For 1968, Muncie's close-ratio M21 joined the M20 on the option sheet.
For fans of automatic transmissions, Pontiac offered the three-speed Turbo Hydra-Matic 400 both years.
Neither the VIN nor the cowl tag indicated the original transmission, but as with the engine, Pontiac did start stamping a partial VIN on the transmission in 1968--for manual transmissions, look on the passenger's side of the case; for automatic transmissions, look on the driver's side. The two-letter engine code stamped on the engine block will also indicate whether a manual or automatic transmission backed that engine.
 
 
Gordy

Well I must adjust my earlier comment. I have seen numbers stamped on the top of the mid plate on some years but I just checked my spare M20 and there are no numbers stamped on it as far as I could see. IIRC though it coded out to be a 64-66 case and I don't think they put numbers anywhere before 67. It was replaced before I got the car so I'm no help.

My 4sp muncie has my serial number on the top near the mid plate.

Mine is on top also, glad to hear of another on top.

So I'm not crazy after all. Well I don't want to jump to any conclusions but at least the memory isn't completely fubar.

Fubar - I finally learned what it meant watching Band of Brothers.

Same here! And who said TV was a waste of time??

Been using that since I was a kid. I guess now I have to find out what Band of Brother is. Then I will know everything there is, I suppose.

It's "Band of Brothers". WWII miniseries created by HBO. I think there were 10 or 12 two hour shows. Anyone into the war in Europe will love it. (I'm sure 100% of anyone into WWII has already saw it)

Finding Private Ryan also references the word and meaning.

If you don't have 24 hours of TV in you, you could just ask us or google it.

SNAFU is another good term from WWII.

That ford 3 speed is supposed to be indestructable.