Tuff Country 14056 - GM 07-13 Silverado 1500 4wd 4 lift kit - Manual (Page 5)

8. Working on the driver side, remove the upper clips off the
upper strut studs. Remove the nuts holding the strut into the
upper location and save. Remove the strut from the vehicle
and remove and discard the lower attaching clips. Set the
strut aside. Repeat procedure on the passenger side.
9. Working on the driver side, place a hydraulic floor jack
under the lower control arm. Repeat procedure on the pas-
senger side.
10. Working on the driver side, loosen but do not remove the
nut holding the upper control arm ball joint to the knuckle.
Special note: Using a hammer and striking the knuckle
will help break the tapper. Once the tapper has been
broke, remove the nut and upper control arm from the knuck-
le. The hardware may be discarded. Repeat procedure on
the passenger side.