1969 Muncie Transmission Stamps

[COPO]

Originally Posted by Rumbleguts396

https://www.ebay.com/itm/Rebuilt-Ori...53.m1438.l2649

This is the Muncie I was considering. Thoughts on it anyone?

Looks like an M-22 assembled August 31, 1968. One easy way to tell is the input shaft on an M-22 will not have any grooves. One groove would be M-21 and two grooves M-20. This identification method works so long as the input shaft is original to the trans, but pulling side cover is always best.

I've never seen a POP that has the letter of the trans stamped regardless of year or build date of the trans. Oct. 1968 is when the A, B & C were stamped as part of the trans assembly date with "C" meaning M-22 which is why the ebay trans is missing the letter as it was assembled Aug. 31st of 1968. .

[BARRY]

OCTOBER 21 1968 muncie started the A B C

[tom406]

If it were assembled anytime during calendar year 1969 it would have an A B or C suffix as stated. Always a good idea to check casting dates on the case and tail housing and make sure they precede the assembly date by weeks, not years.

[bergy]

The transmission in the link has an assembly date of 9M31

[the427king]

October 68 is when the codes started to get used based on what i have here.....all the P dated P9P xxx cases didnt have codes [september] I have mixed R or october dates S and T [Nov and dec ] all have codes ...

[Kurt S]

http://www.camaros.org/trans.shtml#4speed
To distinguish between Muncie types, if the Muncie was built after 21-Oct-1968, the transmission code contains one of three letters at the end of the build code...

[bbbentley]

Looks nice and correct to me.

[Rumbleguts396]

I can't Thank everybody enough for there input. You guys are the Best !!! ROB

[Rumbleguts396]

Just so I understand better. The assembly date stamped on it being 9M31. Was this transmission assembled August 31 1969? or 1968? sorry guys I'm just a bit confused and want to understand. Thanks ROB

[Bill Pritchard]

Originally Posted by Rumbleguts396

Just so I understand better. The assembly date stamped on it being 9M31. Was this transmission assembled August 31 1969? or 1968? sorry guys I'm just a bit confused and want to understand. Thanks ROB

The '9' signifies the model year, which would be 1969. Since 1969 Camaros were produced late into the fall of 1969, you would need to cross-check the VIN for a rough production date. CON VIN shown on that trans is 19N513117, so if that is an early production 69 Camaro, then the trans was most likely built in August of 68 and the suffix letter would be missing. If it's a late production 69 Camaro, then it was undoubtedly built in August of 69....and should have the letter suffix at the end.