I don't have an LGT or even a gen 4 but my gen 3 has 183,xxx. As far as I know the engine, trans, diff, etc are original.
In the last 6 months, I've replaced all 4 struts, front brake pads, resonator, valve cover gaskets, tires, instrument cluster, radio, headlight housings, air intake, spark plugs, plug wires, exhaust manifold gaskets, donut gasket, gasket between manifold and catalytic converter, gasket between resonator and muffler, resonator spring bolts, turn signal stalk, shift plate, rear left caliper, and speakers. In the spring I'll be doing the head gaskets, timing belt, and pulleys/bearings. Will also replace various bushings, etc. Previous owner replaced the muffler with a walker quiet flow SS. Poor thing has had a rough life.
Also forgot to mention inner and outer tie rod ends were just done.