On the inside glovebox lid there should be a sticker with a bunch of 3-character codes. Would you take a picture of that and upload it into a message? I'm curious if you have G65 and ZW7 (known as Premium Smooth Ride).
I would mention that Detroit Axle parts don't have a great reputation here. YMMV
Also there have been instances of the center link in the steering being installed in the wrong orientation. I think
@SnowDrifter has a post about that.
At ride height the (front) jounce stops need to contact the lower control arms. If the stops are missing, damaged, or not making contact with the lower control arms, that can affect the stability of the truck.
Lastly, have there been any changes to the height of the truck? Slight lift or drop? Keys cranked?