ID 50's GM OD Tranny

I'm looking at picking up a 55-57 GM OD tranny. The rear case is stamped R10X-1. I can't find anything on the R10X - lots on other R10 codes - R10H, R10E, R10G, etc..

Any idea what X signified? Would the parts swap over to my R10H-1? It looks exactly like my 55 R10H-1 (no rear crossmember mount).

Any help appreciated.

 

welcome to the hamb...now post a picture of the transmission so we can see what you have.

picture posting help is here:

http://www.jalopyjournal.com/forum/forumdisplay.php?f=6

 

Thanks for the welcome. I've been into 55s for 30 years.

I'm just considering this tranny, the pics aren't mine.

Sure looks like my R10H-1. I wonder what the X meant.