Alright, well according to this website
GM FWD Transmission ID charts
my trans is a 2001 4T65-e

The code on the tag is 611XAB, not XAR like i said before, couldn't read it well from under the car

So I've got a 2001 trans, a 98 PCM, and is there any way for me to determine the year of the engine beyond pulling the throttle body off and taking pictures of the inside? I don't have time to do that in the next few days...