The 2.9 is a lil powerhouse givin its displacement and era it was built in.
It makes more HP per CI then a 5.0L H.O or a 351 Lightning, so techinacaly it could be called a high performance engine.
They run alot harder then the 3.0 does, and in my opinion not much less harder then a 4.0. They do tick and leak oil, but keep them cool and they will litrally run forever.
The 2.9 doesnt really need a whole lot of RPM to be happy. Obviously trying to turn 35in tires with stock 3.45 gears is going to result in a turd. But a reltivly stock truck with 31's or 33's and some 4.11 gears and they have more then enough giddy up to get you in trouble.
IMO the 2.9 is probley the best rounded/most suitable engine in a ranger, it gets better mileage then a 4.0, has more power then a 3.0, and is as reliable as a 4banger.
later,
Dustin