I have had several jeep`s too.
At the moment I have a Jeep CJ-7, I have swapped out the old and tired 258 and installed a v8 lt-1 salvaged from a 1994 corvette. put on a lift kit and airlockers in both axles.
I have had some jeep wranglers as well.
If the jeep you are picking up is original then there is not mush to look for, but if the jeep is modified with a lift kit and larger wheels, look out for noise in the rear axle. And vibration from the rear drive shaft.
If you are looking for aftermarked parts for your Jeep, I can recomend.
Those guys are the one and only company in the US I are buying parts from due to their extrem good servise and fast delevery.
also check their forum site..
here is some other links as well.
Best regards a fellow Jeep`er