Originally Posted By: Johnny2Bad
Poly bushings are really for high performance vehicles; ones where handling and cornering are the priority. They ride harsher and generate more noise. The factory rubber (probably synthetic rubber) and OEM replacement bushings are adequate for a stock vehicle, are engineered for maximum Noise, Vibration and Handling qualities (NVH) and work well for quite a while, but are a replacement item in a high mileage vehicle. It's more of a time thing than a mileage thing; say every 10 years or so.
I use both, but only the Miata (see the sig) gets Polyurethane, and in that case it's a full kit (every bushing on the car). Although I bought a full Energy Suspension kit, in certain critical areas I use other brands as the durometer rating for Poly is fully configurable. In layman's terms that means they can as stiff as you want, ranging from hard street to hard race, with ride quality suffering as you go harder while responsiveness improves in step. The truck and the PT Cruiser get OEM rubber.
You can get zerk fitting sleeves to go with a poly bushing install; it's an aftermarket performance part so you need to know a bit about your car to order the right sizes (no vehicle-specific kits). I'd have to dig deep in my parts list to find the vendor. If anyone is interested, PM me, no promises, but I'll try.
A tub of Energy Suspension lubricant rather than the small tubes that come with the bushings themselves is cheap (I think I paid $9) and will last you seven lifetimes.
Sounds like the poly is what I want. The truck is split between back roads and highway, but the back roads are very winding, slope the wrong way, etc. making the truck roll over and eat up the outsides of tires. I'm pretty sure its 32mm front, 28mm rear. This is the front poly set I'm going to buy. I can't see the fitting, but it looks like a zerk that would connect to my grease gun. Does that mean I use the regular grease I use for ball joints, etc or do I need to change the gun to a different grease?
http://www.prothanesuspensionparts.com/3.5214