So, sorta back to my original question, how do I tell which diff I have? Powertrax lists 10 different GM rears. And there application app doesn't offer anything for a '16 Express of any size, much less my 3500. They do list it for yours.

I just emailed them.

 

Stan your diff tag has all the info
Go out there ( right now ) ....lol and take a pic
of your TAG on the diff..
if you do it I will do it ... lol

 

I would say they will still need to know which Diff you have
either the 60 or dana 70 so I bet they will ask you lol
soooo get out there.. lol

 

taking what ARTIE 1 mentioned .... ( cause he has many vans ) you wont know
for sure till you look at the tag on the Diff.. I know that be true with Fords.
when I raced I used ford 9 inch and they all had tags that told what
gear and size of the diff. gotta look at the tag.

 

Here is my Diff Tag
so you can see
with my tag
I am not sure how to translate it
have to do some more research .... unless someone
has already done just that
which one translates what diff it is... Dana 60 or 70 ?

 

Yeah, that ain't happenin'. It's 17F out there, and I just am able to walk without a cane today. It's gonna be above freezing on Monday(37F) and damn near balmy on Tuesday (49F). So, maybe then.

 

well that will give us some time to figure out
how to read the label and which numbers mean what

 

Already on it.

Differential Identification | Gearhead Diva

 

And another;

Dana Axle ID & Application Guide

 

And one last one;