Youre right, we are probably harder on the car than most. Not abuse, not neglect, just aggressive. The motor is holding up well, It's had a few dyno pulls, and 2 passes w 150hp, and countless with the 125hp. It has been through it's fair share of bottles with no indication of giving up the ghost. I would say that the 4.0 is seemingly stout, the trans is doing well, the rear could possibly be set up to live as well.