It utilized new "low density" taillight lenses with a grid-style pattern rather than the "louvered" pattern in use since 1981. The Trans Am came standard with the "High Tech" 15-inch concave aluminum wheels from the previous year, but it was also now available with the a version of the 15th Anniversary's WS6 suspension and its "Aero Tech" 16-inch aluminum wheels, but in finished Natural Silver. A Borg-Warner 9-bolt differential was made available for the first time, and was said to be stronger than the standard corporate 10-bolt axle. The standard rear spoiler from previous years was still standard, but an optional wrap-around "Aero Spoiler" was now available in black and gave the car a new more modern look, (it is unique for 1985 &amp