The DSS Spool is now available, made from high grade aircraft quality material and machined to fit your factory speed sensor gear and final drive gear without any modifications. The standard 27 spline spool uses the same spline size as the factory differential and will work with any axle and intermediate bar from the OEM up to our Level 5.9. Our precision machining process ensures superior strength and fitment over many of the other spools on the market. When you need to get the power down to the track without any of the compromises of the factory differential, the DSS Spool is the answer. The DSS Spool is for drag race applications only and is not intended for street use.