Prothane’s polyurethane is a firmer bushing than the O.E. rubber. This yields an increase the longevity of the bushing.
There is also a direct improvement in handling performance. Rear axle tracking will become more precise and there will be less tendency for vehicle “wander” on the highway or “kick out” when diving into a corner.
It must be noted that with a firmer bushing there will be a slight increase in NVH (noise, vibration and harshness).
Both the red and black urethane bushings are identical in formula. Historically, red is preferred for racing applications, since a flaw (or crack) in the urethane will be much more visible.
Replacement instructions are simple. Just get the old bushings pressed out and you can then insert the new ones.
As always, there is a satisfaction guarantee with this product. If you are unhappy with it, for any reason, just call and we’ll make it right.