Check for metal shavings in your oil. Failed Vacuum pumps on K2 trucks led to some issues of metal entering the engine.
The Covid outbreak has no doubt delayed auto production. Colorado is getting long in the tooth.
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
Had mine replaced under warranty. Even the newer elements do take a bit to warm up. Not long though. Maybe 3-5 minutes once you sit down. My 05 Avalanche would warm well in as little as 1-2 minutes
Nothing really changed from 2019-2020 suspension wise on T1. Engine/Transmission combinations with the 10 speed. Yes. Now from your K2, yes. Whole new frame and all. Reduced weight can also factor in to the Suspension feel. However, Suspension is a loose term. You have to consider the package types in this. Such as Z71/X31 Vs 2wd, 4wd Max Tow etc. The list goes on and on. OP, I recommend you test drive several trim levels/suspension packages to see what fits your comfort level best. Compared to your 2014 K2, A 19 or 20 T1 with similar setup may ride better or worse to
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