’03 TB trans questions

Hey everyone, new to the forum and to Polaris..but not new to atvs. I picked up an ’03 Trailblazer that has been mostly dismantled. The previous owner has the transmission out of it, and says that he pulled it out and had a shop put new bearing in it, but is missing a pulley off of it. The case is together, and both splines spin..just don’t spin together. I have not tried messing with the gear selector shaft on it to see if it’s in neutral yet or not.

Is there a way to tell if the trans is good without pulling the cases apart? I hesitate to pull it apart without a diagram, as I am still waiting on a manual to come in the mail for this atv.

The pulley I have found on ebay, but have not purchased yet. Also, does someone make a rebuild kit for these transmissions if it is messed up internally? I’d imagine the kit would be cheaper than finding another transmission for it.

Thanks in advance for all of your help!