i just got my 17 Denali 2 weeks ago. Sold the 15 with only 13k on her. I noticed instantly the insane injector rattle when cold and take off . I sent GM an email about it. They've contacted me and want me to take it in for a look. Oil pressure Varies a lot also seems like. 90 cold to 30 hot. Mighty big swing I feel like. Tranny shifts are very noticeable and sometimes slightly brutal for a guy with a light foot. I'll definitely keep you guys up to date on any changes they may make in my tune to possibly get rid of the noise. With many complaints they'll have a recall for it shortly
The drive is very nice, and very quite inside. The new motor does have what sounds like injector function/rattle at low speeds, I can hear it leaving from a stop until about 15-20mph. I didn't notice any deceleration rattle like others have mentioned. The truck throttle response and mid range is on point, and really does feel like GM spent some extra time on the tuning this time around. So far I'm very happy with the purchase, even though I was pretty attached to my LBZ. For those wondering, you can get these $70k loaded High Country trucks for $58k, only thing I didn't order was rear entertainment pkg . I have a post on DF, where everybody is keeping track of "Out the door" pricing.., for others to know what to bargin for model wise.[/QUOTE]