First question is, I have an 06 pierce modified I'm going to run as a 3 link b mod so my question is would it be easier to switch to 4 link? Also has a ford 9 inch, my next question is about the shock/spring setup that's on it, it has lr and rr set up as a coil over in front of the axle, good, bad? Any suggestions are greatly appreciated! Also for a j-bar would you recommend a biscuit style j-bar or solid?