This is an optional Traxxas TRX-4M Front & Rear Axle Shafts/Stub Axles.
Give your TRX-4M™ the ultimate drivetrain upgrade with the heavy-duty axle set. Made from high-grade hardened steel, the heavy-duty axle set is the ultimate in strength and durability. The set includes front and rear axle shafts, front stub axles, cross pins (2), 1.5x7.8 mm dowel pins (2), and 1.5x6mm dowel pins (4).
