Just turned 125k on the 5.7 Grandy. Spent $150 this last year on parts (front diff mount bushes). Dealer installed the "Service 4WD system" when banging about underneath. I took it back and they took 1/2 a day to find the sensor they knocked up, at their cost.
Haven't had any trouble with it. Goes like a scolded cat. I whipped a Porsche Chayenne at the lights last week, often flog XR8 falcoons, too easy. Its a long way from the V8 Landy I had last, there was something to replace every damn week on it. Lovin the Jeep.
2014 Hi again, now got 300,000km on it. Air con just 'went warm', otherwise no probs. 4WD system never came tack to haunt me. Cracked a radiator (my fault) and just replaced a water pump, at this age - not bad. Radiator $250, water pump and thermo, pulleys etc a couple of hundred. Still haven't done plugs. Goes like hell. Love it.