ne of the primary problem areas in classic muscle car suspensions is the use of rubber bushings. They were cheap to manufacture for mass production and provided isolation from road noise and vibration, but rubber has a significant trade off - its relatively soft durometer (hardness) allows for significant deflection of the chassis components under load. The rubber bushings twist and deform as the suspension components rotate, causing premature wear and unpredictable handling. Rubber eventually dry rots when exposed to the elements and degrades in the presence of grease and oil.PST
perfected polyurethane with the introduction of POLYGRAPHITE
, a special formula incorporating a low-friction graphite lubricant into the actual bushing material. With POLYGRAPHITE
, you get near-zero deflection performance of polyurethane with a self-lubricating bushing. As an added benefit, POLYGRAPHITE
is impervious to grease, oil, weather, and other natural elements and will never dry rot.