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I'm looking at updating the suspension on my '67 with a grab-a-trak spring and handling kit. While I'm at it, should I replace the original upper and lower control arms as well?
I put all new stock type bushings in mine but if I was building a road racer, I'd go with the polyurethane bushings in the upper and lower control arms and a roller spring perch. Check the arms for cracks while you're at it.
They are a hard material that flexes less (if at all), giving you a firmer ride with more accurate tracking. The down side is, you pick up more road vibration. It all depends on what you're going to do with the car.
I know several instances where polyeurethane has caused too much stress on strut rods. The rods have cracked and broken.
I do not recommend using the polyeurethane for the strut rods.
One other down side to poly is a tendency to squeek. I did use poly on my front suspension rebuild, no issues and I did use a liberal amount of lubrication during installation. I should mention that I only have about 2000 miles since the front suspension rebuild.