Gordy first of you were right, im glad i saved some mod money to get it running good. Im from north texas and its been 80 degrees since I got the 01 tahoe and now that is cold im noticin some things. When I start it squeks an continues for awhile but doesnt do it all the time. I use rockauto.com for parts so if somoncn help me out on what it might be.
So now upkeep list
1. fix sqeek (belt or pulley)
2. brakes (front and rear)
3.trans service with filter
4. i sur there is more
Do a serpentine belt for the squeak. I had that problem since new on my 01. Belt looks good but a new one will make the squeak go away for about 20-30k. Skip trying belt dressing it will make it worse a belt is 28 bucks. Do the AC belt while you are doing it.
Fix brakes. I have had very good luck with stock rotors, and ceramic pads. I really see no need to upgrade to fancy rotors, and pads. Tahoes, and burbs were designed to tow, and accounts for it in braking design. I have always thought the tahoe had good braking. You may find the rear dust shields are rusted out replace while you are in there.
Do a trans flush and filter. Do not do fancy trans tune additives or flush cleaners. Just drain filter, and fill. A lot of people end up with problems from them down the road.
Do a radiator flush.....See recent post on "Weak heat" as to why you should be prudent.