Join Date: Aug 2008
Location: Miamisburg, Oh.
Given your desire to keep things stock, I don't think you need to box your control arms.
If you had a built up motor, or big block, and were going to drive it hard or had plans for drag-strip runs sometimes, then I would say to box'em.
I did box my stock lower control-arms on my '66 because I do drive it hard, do burnouts, have an upgraded rear-end and sticky tires, manual tranny, etc.
The rubber vs polyurethane debate depends upon your budget, driving habits for the car, and maybe even how smooth your roads are and tolerance for a slightly firmer ride.
The poly bushings are superior in most every way - but they will transmit a bit more road-noise and harshness of bumps like we have on roads with 4 distinct seasons.
You would notice that more with low profile tires versus the stock-like tires with cushy, big sidewalls.
In my opinion, Rubber is fine. I personally leave the poly for my more performance oriented rides made to handle well.