8. With the housing prepped and ready to go, Draper inserted the large alignment bar in the housing and through the pucks under the carrier bearing caps seen earlier. Similar pucks were placed in the housing ends and also slid into place. The housing ends must be aligned perfectly. If not, the axle will eat up bearings, ruin axleshafts, and cause the diff to go all squirrely. This is why it’s important to leave housing modifications to the pros.