Munice case # on side

[Larry Clain]

I have a case with out a S/N for the car but stamped "F9S01A" on the right side of the case and at the top is a small rectangle stamped into the top boss where the tailshaft bolts to the case. Cast # is 3925660.

Is this a replacment tranny?

[Wayne M.]

Re: Munice case # on side

What looks like an "F" is really a "P" (for Muncie 4-spd) The 9 is the Model year (1969) and The S 01 is November 1st assembly.

[Joe L.]

Re: Munice case # on side

Larry-----

As Wayne mentioned, the transmission is a 1969 unit as confirmed by both the production stamping and the main case casting number. If the car is a 1969 and the car's build date is consistent with the transmission's build date, then it's possible that it was never stamped with a VIN derivative at St. Louis. Mistakes do happen and this sort of mistake might be easy for a final inspector to miss.

If the car is any year other than 1969, then the transmission is NOT original to it. However, the fact that the case is stamped with a production code indicates that the transmission was, at least, originally a SERVICE assembly.

[Larry Clain]

Re: Munice case # on side

Thanks for the replies guys.

This is just something I found under the workbench. I was on another forum that was discussing the S/N stamping locations being stamped on the L or top side of the case and then I find this one on the R side? There is no other Vin # which I found strange. OH and by the way that is a "F" for sure on this case. it is clean and looks new and the letters are easy to see.

My '69 motion is a Th-400. I don't know where this came from but it may be the original tranny out of my '69 SCCA L-88 car. Right now it is just a bare case and tailhousing? Don't remember where it came from. I have a huge amount of extra parts that I am going to orginize and ID and then sell this spring or summer.

I am planning on building a new garage at home (55x75 two stories tall) and will be needing to raise money to pay for it. I used to run a Corvette bodyshop/garage back in the 70's and all the extra parts are still lingering around. I knew that someday that they would be valuable and bought all that I could. I have listened to my friends/family tell me that I needed to get rid of this "junk" for years. Wonder what they will have to say when I start to sell them off in todays Ebay market.

[Joe L.]

Re: Munice case # on side

Larry----

I've never seen an "F" prefix for the production code on a Muncie case. I think that what likely happened is that the "P" character was stamped at an angle and the "loop" on the end of the "P" didn't make it. So, the "P" appears as an "F". The rest of the stamping is as it should be.

The way that it generally worked, at least for 1969, is that the stampings on the right rear vertical surface of the case would be like this:

1) No stampings, at all= SERVICE maincase was installed at some point;

2) Production code stamping, but no VIN derivative= SERVICE transmission assembly. Transmission originally purchased "over-the-counter";

3) Production code stamping + VIN derivative stamping= original transmission used in PRODUCTION and assembled into the vehicle for which the VIN derivative originates.

[Larry Clain]

Re: Munice case # on side

Joe that is my thought on this too. I will try to remember to send you a pic of this because I feel postive that it is a F and not a P. were these not in a holder to hold them together and punched all at the same time.

This is a very clear stamping. I will have to take it out in the bright sunlight just to be sure but I feel it is as I say.

Think I should call Sinor to look at it?

[Joe L.]

Re: Munice case # on side

Larry-----

If the characters were not stamped by a gang-style fixture (i.e. the characters are "offset", differently spaced, and/or irregularly imprinted), then it's anyone's guess what it is. It may have been a SERVICE case that someone stamped. Also, it may be some sort of proto-type piece that received a unique stamping. I have no idea what an "F" could refer to as far as a transmission case goes. There was no GM transmission plant, and certainly not the Muncie, IN plant where these transmissions were made, that used an "F" coding to my knowledge.

[Frank H.]

Re: Munice case # on side

I'll bet the letter P stamp was just wore out or broken,as the rest of the stamp looks normal for a passenger car,not always having a vin stamp,
I have two 660 cases that are service stamped and they where stamped
CCO = chevrolet,Case,1970 then a sequence number. the other is same except
CTO = chev,trans,1970 S#