This is the labor to assemble a frontend unit with no outer knuckle, brake, or hub assemblies. On a 9" frontend this would include installing the 3rd. member into the housing, and installing the inner axle shafts. On a RockJock®, Dana 60, or Dana 44 frontend, this includes installing and sealing the cover, and installing the inner axle shafts. On RockJock® and Dana axles, this labor charge is in addition to the center section set up labor charge.