i didn't build a jig off a yfz but i measured the hell out of one i got it as close as possible. the spindle stays level threw travel. i'm making everything bolt on just to prove the concept then plan on cutting off the blaster mounts and welding everything on if it all works. just wish i had the rest of the parts to try it out now just a few things got me nervous hoping i can talk my buddy who gave me the arms into pulling a few parts off of one of his yfz's so i can test it some more. I might try to sleeve the ball joints thanks for that tip. if i can get him to pull a set of shocks might just put my spindles on there either way just to move it around the yard a bit and see if how it feels i have a feeling it's going to sit a lot higher.