Dana Corporation's Commercial Vehicle Systems has announced expanded ratio coverage for one of its newest families of single drive axles. The new Dana Spicer S190 series is now available with a 2.53 ratio, the fastest axle ratio for a single reduction drive axle produced for the North American trucking industry. The 2.53 ratio option for the S190 axle was designed by Dana to maximize fuel efficiency with the newer generation of emissions-friendly engines that operate best at lower RPMs.