Just installed these on my 3500. The lower bracket is not totally level on the axle because of the way the bracket fits into the bail clamp on the leaf stack. Looks like the original leaf stack bail clamp leans forward slightly hope it is ok like that.

 

I checked out another truck like mine with the same airbags at the parking lot the other day. They look identical to mine so I figured I got them installed correctly. The set I was comparing them to were on a 04 Ford F-350 we had and they sat straight up and down.

They worked perfectly on my last trip so I am happy with them.

Nice GSP!