3. It's important to install the axle sleeves first, as welding the gussets on first can create a slight bump on the inside of the axletube and this can complicate sliding the sleeves in the housing. There are six welds used to hold the sleeves in place in the axletubes-four plug welds in the axletubes and welds on each end of the tubes. Here, Ament drills a pilot hole for one of the plug welds using an 1/8-inch bit. Then he used a 7/16-inch bit for the final hole.