Most people say that changing over to aluminum wheels has been the single most effective improvement they have made to the ride and performance of their  GMC. This is mostly due to the improved feel and balance of the Alloy wheels.  The original steel wheels are now approaching 50 years old!  Most of them are bent, out of round, and just not easy to balance. The Aluminum wheels are very easy to balance and true the wheels. This gives you the smoothest ride you may have ever had in your GMC.