Rawze.com: Rawze's ISX Technical Discussion and more

Has anyone ever used these polyurethane bushings. I'm replacing all my steer axle spring bushings and torque rod bushings in my AG400 rear suspension on a Kenworth. What's better and why? Polyurethane, rubber or greasable?

I tried these on torque rods on a peterbilt and carrier bearing and the carrier bearing did not hold up well and the torque rods seem to last longer with the oem rubber I was kinda disappointed with the product.