I want to install KPs 6 link cantilever set up on my 86 gmc truck. The problem i have is that i have a 4 link installed right now, so i had to remove the spring perches and now i find out that the KP 6 link connects to the spring perches so i have to re-weld some back on the rear end. Only problem is i dont know at what angle--up or down and how many degrees to weld them back on the rear end. If anyone knows what the angle of the spring perches are installed on the rear end or if someone could maybe get their angle finder out and tell me what at what angle their perches are installed on their rear end i would really appreciate it, thanks Michael Hill