Our Stampede/Rustler/Monster Jam Universals carries the same design features as our popular Slash 2wd universal kits: large diameter universal driveshaft bone for more durability against the power of today's Lipo battery/Brushless motor combo, strong carbon steel universal for the axles that features two sets of pin holes, carbon steel joints and joint pins and also carbon steel diff outdrives. These are an excellent upgrade for your Monster Jam/Stampede or Rustler trucks.