Free: Contests & Raffles.
The reason there are so many Ruger upgrades is because they're necessary.
Carp, to add to what others have said, that 4.0l motor is probably Jeep's best ever but it's a known oil leaker from every possible orifice. Transmission cooler lines are frequent leakers but easy to change, the biggest issues on the newer ones IMO is the heater core! The newer Jeeps are well known for eating heater cores on a pretty regular basis, I have been wanting to put a zync in a couple of these problem children to see if it will cure them.
Weak points: Front door hinges sagged and bent - all on their own - no weird usage, just normal day to day use. Automatic trans failed at about 110,000 miles. Replaced it with a factory rebuilt unit. Factory header developed a leak, had to be replaced. Those were the only three significant problems our Jeep GC had. The door hinges ticked me off, but everything else was pretty much expected. Ours was a '95 though - perhaps Jeep corrected that issue by the '04 models.
Everone I know with a GC without a V-8 wishes it had more power.