eMobilityComponentsVideos Spicer® AdvanTEK® 40 Tandem Axle Increases Efficiency By Motion+Drives - February 18, 2018 The Spicer® AdvanTEK® 40 tandem axle from Dana improves the entire powertrain system. It increases efficiency in the axle and reduces churning loss. In addition, an integrated differential case provides a less complex design.