I was at the junk yard browsing through the stack of transmissions when I noticed the different factory tags on the 4l60e transmissions. One had 8SHD on it, the other 6SHD, and 8FBD was on one that looked to have a Trailblazer bellhousing.

Is there any major differences between them all, or are they just designation tags for things like; van, truck, car, etc...