Suspension is one of the critical systems of your vehicle, both from performance and more importantly - safety. The factory engineers were well paid, smart folks that designed a reliable system. Their "problem" if you can call it that, is that they had to compromise for all the different uses the truck would be put to during its life, from freeway driving, off road and hauling to picking up the groceries or Gran ma for thanksgiving. If you are going to change stuff to benefit performance, you will have to sacrifice something somewhere else. Iv'e never seen a "design triangle" similar to the value triangle ( above in the thread ), but its probably something like "performance / comfort / safety" or something like that. DO NOT compromise on safety ( be prepared to reduce your truck's capacity to haul and / or brake a load etc. from factory specs. ) - do your research, and find a company that specialises in performance and quality fabrication - ie. backed up by real world testing ( autocross, racing etc. ). I would suggest looking at the kits by Hotchkiss. Certainly not the "cheapest", but they are well tested in the competition space. I have not seen many other companies extensively test their products in competition - however happy to be educated / corrected on this...
