tarch at school said:
yeah... start by changing your oil...
i still haven't done it myself... but i did swap out my axle and tranny... go figure..
1. We're not talking about the same car, are we?!?!
2. Did you stay at a Holiday Inn Express last night?!?!
(Sorry, couldn't resist bud! -

)
OK, yeah, first maintenance job is to chg oil - if you find this is more than you want to do, then I'd suggest paying someone to take care of your maintenance and upgrade needs - no shame in that.
Trannie fluid swap is straight up. You'll need a hand pump and 4 qts of GM syncromesh ATF or Mobil 1 ATF or similiar.
Jack up the front and support with jack stands. Slide under with a 3/8" ratchet and locate the drain plug on the pass side of the trannie. Open and let drain completely, then replace at 12 - 22 ft/lbs of torque (not too tight!)
Drop the car back down and get inside the pass side - remove the console piece around the shifter, then the rubber shifter boot (4 bolts). On the pass side of the trannie, toward the front of this opening, you'll find a rubber plug. Remove it and insert the output hose end of the hand pump into the hole that the rubber plug occupied and start pumping - 3.2 - 3.5 qts for the Tremec 3650. (I think the manual actually calls for 7.6 pints). Re-insert the rubber plug, the shift boot and the console piece. Take 'er for a spin and then ck for leaks.
Mobil 1 ATF in my wife's 01 made a very noticable difference - definately smoother shifting.