104,000 miles GMC Jimmy 4x4 with power everything

They're decent vehicles. If all has been taken care of, the transmission should last until around 200,000 mi, and that's usually the first major thing to go. Sometimes the fuel pump needs replaced around this time, so expect that one to come up if it hasn't already been replaced. On occasion as well, ball joints are getting close to replacing, but that's a pretty easy job. Otherwise, you should be able to settle in for a while and enjoy your vehicle. Also, fuel economy isn't the greatest....don't expect to get more than 21 mpg on the highway. (the 4.3 V-6 isn't known for it's economy.) The parts are cheap, and the trucks last. Hope this helps.