:question: i am trying to identify if the transmission that i have is a sm 420. does anyone know any distinquishing marks or codes for gm transmissions? or does anyone know where i can find this info? i dont know what it came out of but it looks like a 420.

well the easiest is to see if the case length is 10.5" if it is it is a 420:D

http://www.off-road.com/jeep/tech/convtrans/gm/gmsm420id.html

i told you it was a sm420:flipoff2: