The 232 In-line 6 cyl. motor went bad at 65,000 miles. I replaced it with the AMC 360 V-8 and it was a great choice.
Transmission has been replaced 3 times (see above for the reason, not designed for the power)
The CJ5 is a blast to own. They may not handle like a sports car, but they were never designed to. Plus lets see a car or even a pick-up go where this can go.
With a bit of work they can go on forever. Mine is now 25 years old and still is very dependable for everyday driving, they able to take me DEEP into the woods on the week-ends.
In reality Jeep's are sports cars. Enzo Ferrari called the jeep "america's only real sports car".