Originally Posted by aboatguy
Are you going to get into the front suspension business?
I've played with that idea a number of times. I actually have a prototype system on my own car that uses Delrin lined Aluminum bushings in the stock A-arms and a custom upper spindle rod that I think makes assembly much simpler and allows for an adjustment of how tight the end clamps are on the bushings. This adjustment would be able to be locked in place and allow you to remove any binding of the upper A-arm while removing nearly any axial play.
Keep in mind that binding can be an issue in the front suspension as well. Picture the stock upper A-arm with the bushings in place and the nuts on either end tightened. If you tighten those nuts too much you'll start to bend the two legs of the A-arm together (think of pushing on the ends of the legs of a wishbone). This causes the bushings to lose their co-axial characteristic and can impart a bind on the spindle.
I removed the spring and shocks for my front suspension leaving the poly bushings and stock spindle rod and nuts in place. With just a little bit of torque on the nuts the suspension would drop VERY slowly from full bump to full droop under its own weight. Then I installed the Delrin/Aluminum bushings and adjusted the clamps as described above. Now the front A-arms would move freely up and down and had minimal axial play. Just like in the rear suspension this allows the spring and the shocks to do all the work and removes any inconsistency of an unknown binding rate.
Global West makes their Del-A-lum bushings and since the ones I made were pretty much the same I figured there was no reason to duplicate an already excellent effort there. I was hoping to partner with them on the C4 bushings, offering there bushings as part of my kit that would offer all the bushings and both upper spindle rods with clamps for each side. Unfortunately I wasn't able to make that happen despite being in contact with them a couple of times. I don't want to get into IP issues over the Del-A-lum bushings and frankly can't as cost effective as GW given the small size of my business.