I am planning on putting a 6" lift on my 90 K-5 in the next month or two. With 6", I know I need to change the driveshaft. Is there a direct replacement (ie a Suburban) available, or is this just a custom size?? I'm just shooting for 6" with 36's, which will conform to all local laws. Dave Hiller 90 K-5 "The Anti-SUV"