Hi, I took the old 3 speed manual trans. (with the granny low) out of my '57 3100 in favor of an automatic and now I want to sell the old 3 speed. I'd like to know what exactly it is when people start calling me and asking.... are there I.D. codes on the trans.? I found a few sets of numbers and letters like GM18 and 591668, K956 and GM591953, K1256 T. Any help is appreciated, Thanks
