Transmission Questions

[pnaples92]

I just recently bought a 67 C10, I am currently in the process of rebuilding it and am working on the transmission right now but running in to a few issues. I had originally thought it was a saginaw 3 speed but I am having problems getting the main shaft out of the trans. The manuals i have found for the saginaw said you need to remove a c-clip and slide the reverse idler out of the way but it doesn't have on nor could it be moved if it did. So i am now thinking it is not a saginaw but it doesn't appear to be a muncie nor a borg warner based on pictures i have seen. i was told the 350 came out of a 72 c10 and that the trans was original.

the numbers on the case that i can find read: M2P03A, the tag from the side cover is 3980810Y and the tail only has GM6 on it. 7 bolt side over and the trans is fully synchronized.

any help would be nice i can post pictures of the inside of the case if needed

thanks