I have a 2003 2500hd Ext Cab Short Bed that I am going to fab up a 8" of lift triangulated four link rear suspension (don't know if I will put it on bags or coil-overs. suggestions?). But to give myself the best chances of getting it really close on the first run of parts and making it easier to model up on the computer I am trying to get a few geometry specs on the rear suspension and rear half of the frame. Anyone know where I might be able to find them? Techs??? I figure someone probably has them like a frame shop maybe who would use them to fix a vehicle after a crash. Thanks!

I think the only spec you want is centering the axle in the wheel well. Do a search on www.pirate4x4.com about 4 links. Tons of info on it and how to do it right.