Sierra Dan

It took 5 years for the 6112's to actually be released and available for the '14-'18 K2 GM trucks.

This was my guess also. The old greasing of the steering shaft boot........

Was it the "Tenneco" branded Rancho?

Another Russian Hacker.....

Mine lasted around 30k miles but looked 20 years old on the outside. I called them my pogo sticks and happily switched to Bilstein 5100s.

The Early years of K2 GM platform trucks had this same issue. Dealer attempted fix consisted of plastic clips that kept the seat bracket from shifting to the side causing the clunk. My fix was a rubber hose and clamp! Sounds like the T1 trucks are plagued by some of the same problems as the K2s Along with creaky rear leaf springs and other. Here is a 70 page thread on the seat popping noise issue. https://www.gm-trucks.com/forums/topic/154219-seat-movement-issues/page/70/#comments

Shut down the Wet Markets and bring back manufacturing to the homeland. Just my humble opinion.

+2 on this. The K2 trucks have this warm up tick also.

Don't forget about the new rear Independent Suspension as well. Also coming to Yukon and Tahoe

Range type devices only add a band aid to the potential problems and are not a true "delete". Here is a great site explaining why a delete kit works better than tuning afm out electronically. Just my 2 cents. http://bdturnkeyengines.com/afm-dod-info

There is a special coverage warranty on the Vacuum Pump. For 6 years or 72k miles as long as the dealer confirms that the Pump as bad.

How do you like the Open Country tires TK ?

I would not confess that the zevos are better than say other 921s you can get online based on some pics and reviews read within this site. Yes they do bring out the "lines" from the clear lens but then again i remember my halogens did also. The same bulb works in the cargo lights. I have the same set you linked to above.

They will fit any K2 so it is possible your bed is newer or they were stuck on after the fact LOL

See here: https://www.ebay.com/itm/2014-19-Silverado-Sierra-OEM-Black-Passenger-Side-Front-Bottom-Bed-Protector-NEW/283092027123?hash=item41e99986f3:g:-gAAAOSwwHpbahT2:sc:USPSFirstClass!64055!US!-1