Treal Hobby Axial SCX24 Steel Overdrive Differential Gears Set. Constructed from high quality CNC steel, this optional overdrive set is intended for the Axial SCX24 and AX24 micro rock crawler platforms to increase speed by about 14% for better crawling

Treal Hobby Traxxas TRX-4 Brass Wide Trak Kit.

Treal Hobby Traxxas TRX-4 Steel Stub Axle Shafts. This optional set is intended for the Traxxas TRX-4 platforms to increase the overall width by 10mm for enhanced stability and crawling performance. Package includes four axle shafts with four nuts.