What to do for 77k "first tuneup"

[brushrunabout]

2000 SS M6 blue

Ran at the track the first time last summer. Best I could do on very bad "winter tires" was 14.015 at 105mph I think. Not great but beat the competiton I had (it was a newbies track day for GM employees sponsored by a group at work. $25 for as many test runs as wanted then eliminations. I broke my 14.20 bracket since I didn't even know what a bracket was but made it to third runoff)

After that abuse I start to think of some tender loving after 6.5 yrs.

Have always done the basics like:

synthetic oil every 5k
regular air filter every 10k
3rd set of tires at 65k
fuel filter at 50k (looked brand new but I smelled of gas for a while)
new front brakes and calipers at 72K (self)
STP or similar injector cleaner every 10K

other than vacum hose leak up near manifold from exhaust? that was fixed with 20 cents of tube no issues so far.

Should I change the diff, man trans, brake fulids etc?

No big money to spend but want to drive it forever. Mainly commute car that is sweet and gets 22-24mpg for day to day. Gotta love it.

Jim near Detroit

[BIG D's SS]

Change all the fluids, use NGK tr55's gapped to ..050 and a new set of wires.