I was able to crawl under the truck and get part numbers off the shocks and then try to research them. Initially not able to determine if the shocks were 4600 series or 5100. The part numbers only took me to seller sites. But one had a video that might explain it. The 4600 are blue and yellow, like mine, and the 5100 heavy duty are grey. Those are usually installed on lifted trucks. So unless the Fox brand dampen the ride a bit better on the ripples and pot holes in our roads my back and teeth are just going to have to get used to the ride. Looking forward to having some weight in the back to help. It's also really hard to change settings on the computer screen while driving. Kinda like Whack A Mole trying to adjust temps, music, nav, etc. Buttons and knobs were much easier. But I'm just old school and grumpy.