Gov-lock posi?
 

I've got a '77 chevy 1/2 ton, and the sheet on the glove box lists a G80 locking differential with 3:07 ratio. Would this be the infamous gov-lock? Or would I have to pull the cover to know? Also, how do you identify a gov-lock? I've seen eatons before, but wouldn't know the gov-lock if I saw one.

Found you a picture on Eatons page. It will look like this"
http://www.automotive.eaton.com/imag...ockingdiff.jpg

Thanks! That helps!