sincitylocal
+1y
For the most part, they are bullet proof.
After 150,000 miles or so, the piston oil rings tend to show wear, and the engine will begin to burn oil.
Also, they don't like to get hot! Head gaskets usually fail soon after an engine is overheated.
The other things that tend to fail are the Multi-switch(head light, turns, wiper), and the electrical part of the ignition switch. At the age these trucks are, it is becoming more common.