SM420
[img]http://www.jeeptech.com/convtrans/sm420/4202.jpg[/img] [img]http://www.jeeptech.com/convtrans/sm420/4205.jpg[/img]

The pictures came from these guys. http://www.jeeptech.com/convtrans/gm/gmsm420id.html
This page will tell you a little more about the trans.
http://www.novak-adapt.com/knowledge/sm420.htm
If you want to go to the later SM465 like I did, you have to change bellhousing.
You can see it is as Jack said about the mount.


'67 GMC 3/4 292 4spd