If it's a turbo diesel, the crankshafts are good for about 300k miles. (Ask me how I know...)
Harmonic Balancers need replacing every ~100k or so to be safe.
If they're turned up, the rear cylinders run hot. There are kits to help with this. A '97+ (or was it '98+?) water pump and thermostat housing will help with temps if you're working it hard. ('94+ were electronic fuel pumps, so you can't really "turn them up" easily.)
If it's a 5-speed, I think it had a dual mass flywheel. If that hasn't been replaced with a single mass flywheel, you'll eventually get to replace it yourself.
My '96 had loads of torque, got 19-20mpg in a 3/4 ton 4wd if driven easy, and ALWAYS Started, even when only half the glow plugs worked and it was well below freezing.
No complaints about the one I had.
Chris