Originally Posted by pearlkid9988
150k is a lot for the 4.0 if you want the power go 4.0 but the 3.0 will last FOREVER if you maintain it properly they are notorious for getting 3-400k miles. Also be cautious of a 4.0 at 150k they are know for timing chain issues at higher mileage and a lot of times require pulling the motor to fix. My 3.0 gets about 20mpg with the 5 speed but when it was auto it got about 16-17mpg
This is assuming the 4.0 SOHC correct? I thought the old OHV 4.0 was supposed to be pretty rock solid closer to the 3.0. I believe the old 4.0 was produced until MY2001 according to TRS library.
In my opinion, all of the old style motors are pretty darn reliable if maintained at all. That would be 2.3/2.5's up to 2001, 4.0's up to 2001, and 3.0's up to whenever they stopped making them. As anecdotes, my 97 2.3 and my dad's 97 4.0 definitely fit that mold with well over 100k on them.