After reading the post about extending stock toy arms, I started wondering what factors go into designing upper/lower arms. I have a 98 2wd Ranger, and was wondering what challenge would lay before me if I decided to attempt this. I was considering designing a chromoly lower arm that extended 4-5" and could mount a coilover. Where would I find specs/formulas to build an upper arm in proportion to the lower, and incorporate a 3" lift spindle? Also, would it be reccomended to keep stock geometry? I have a fab shop by my house that could build the arms, I would supply measurements/drawings/specs. I figured that half the work of custom a-arms was design, and doing that by myself would lower the cost considerably (then again, I would be liable for any faults in design). So I turn to the experts, any info would be appreciated.