The 4.0 has plenty of power, so you'll like the 02. Being that you had a 99 already, it's pretty much the same truck. I have an 05 GC Limited and it's a great truck, except for the body control module failing, and needing to be replaced at a cost of just over $1300! 

Crazy how much that effects a car. But it was way worse when u got up into the mountains. 9-10k elevation sure jacks with a car. My first bike was carb and the floats would stick at high altitude when it was hot out.... teh suk.