Reattach the new spindle assembly: If youre installing new trailing arms, you may have to transfer the four mounting studs from your old arms to the new ones. Place the spindle assembly as described above (be sure its the right one for a given side) onto the trailing arm studs and tighten the nuts. From the old assembly, remove the shock mount and reinstall it on the new assembly, making sure its from the correct side. Reassemble the parking-brake shoes. Its easiest to complete the rear suspension upgrade without the rotor in place, since youll need to move the trailing arm around. Reattach the halfshaft back to the spindle assembly by replacing the four bolts we removed earlier.