This is the Shift Linkage included with the optional Two Speed Conversion Kit, TRAC4000 used on the Traxxas E-Maxx. FEATURES: Attaches to sub micro servo and controls shifting of gears when the two speed conversion kit is installed Replaces worn or damaged shift linkage components YOU WILL RECEIVE: Ball cup, servo horn with built-in spring, linkage wire and mounting hardware REQUIREMENTS: Using with the E-Maxx Two-Speed Conversion Kit only jxs 2/11/08 ir/jxs &