Sorry to be 'that guy', but a gentle correction is in order...
'800' refers to the 99-06 (and carryover '07) pickups.
The 07-13 were known as '900's, and the 14-19 are 'K2XX'.
Current ('20-forward) are 'T1XX'.
On the latter two, the 'XX' portions are to differentiate the platform. So the Suburban is designated 'T1YC' (per Wikipedia, where I had to look up the 'K2' and 'T1' nomenclatures).
(I mention this because...) My eye is drawn to anything '800', since I'm always looking for anything 'new' (to me) concerning maintenance / repair of these. 'New' is relative, given the platform is 20 years old (!)
Just remove 'GMT-800' from the post title, and everything will be good!