[fredjacksonsan]

Originally Posted by Solomon7

if poly sucks, then why do all the companies use it in their kits?? Just wondering if there are any benefits to poly over rubber

It's lot firmer than rubber. When your Jeep comes from the factory, they want a smooth, quiet ride.

When you lift your Jeep you don't want any play in the parts, so they include polyurethane, which doesn't give as much as rubber (and helps avoid Death Wobble). The price you pay for firmness is noise.