Don't buy a 15. If you must have this body style do yourself a massive favor and get at least a 17. Go drive one of each and you'll notice how much better the 17 will drive (but still nowhere near as good as a GMT-900).
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I bought a late 2015 Tahoe LTZ in 2019. It’s been outstanding so far. I replaced the MRC front and rear struts within a month of purchase under the warranty program I added to the purchase of the car (never done that before, but so glad I did). I also had to replace the rear video monitor system, again under the extended warranty.
My current complaint is that sometimes (rarely) there is a slight rocking vibration from the engine while stopped and the RPMs drop below 500. This happens once a week of normal daily trips?
Otherwise it’s an outstanding vehicle that I wouldn’t trade in for anything right now... except maybe that Yukon AT4 when it releases. Om nom nom.
I think the 8 speed is only used with the 6.2 engine.To me, seems like 2015s aren't much different reliability-wise to 2016s+. Most have the 6-speed transmission compared to 8-speed on 2016s (which some say is a good things as the 6 is tried, true, and proven). In addition the standard checklist and things people already mentioned here, I'd focus on two things which are common on all 2015s+ but maybe more frequently in 2015-2017:
- booming sound
- magnetic ride struts (they suck IMO)
Good luck. Post pics if you pull the trigger.
Don't buy a 15. If you must have this body style do yourself a massive favor and get at least a 17. Go drive one of each and you'll notice how much better the 17 will drive (but still nowhere near as good as a GMT-900).