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Clean MAF
Clean throttle body
New plugs and wires
Change trans fluid and filter - shop will have to do this- it’s not just an easy fill procedure- see link below
Change both diff’s oil and transfer case fluid- see link below
Flush brake system - see link below
Cabin and air filters
Grease 2 suspension zerk fittings
This is what I did around 45k. Already did all these on mine, except plugs and wires, which I’ll do in spring, prob around 75k miles.
https://www.tahoeyukonforum.com/thr...ssion-fluid-change.104171/page-2#post-1267868
https://www.tahoeyukonforum.com/thr...nsfer-case-fluid-early-on.94453/#post-1128531
https://www.tahoeyukonforum.com/threads/don’t-forget-to-flush-your-brake-system-3yrs-or-45k.101226/