Traxxas 4981X Differential Spool (EMX. TMX .15, 2.5)

The differential spool replaces the rear differential gear to provide equal power to both wheels no matter what the truck drives over. If you’re building a T-Maxx^® or E-Maxx^® truck for straight-line sand drags, hill climbing or pulling, you can replace the rear differential with a spool for increased traction.