These Billet Aluminum Driveshaft Carrier Bearings with polyurethane insulators are available for 1963-72 Chevy-GMC trucks. Built to precise specifications, these high tech carrier bearings tremendously outlast the OE rubber types. Built from T6061 aluminum with low deflection poly urethane insulator and precision bearing, these items can handle much more horse power and torque than the cheap factory replacements. No more yearly replacements required.