GMC 1994 Yukon Owner's Manual page 239

A
CAUTION:
Never use oil or grease on studs or nuts. If you do, the nuts
might come loose. Your wheel could fall off, causing
a
serious
accident.
Front Position
Replace the wheel
nuts with the rounded
end of the nuts toward
the wheel.
Tighten each wheel
nut by hand until the
wheel is held against
the hub.
Rear Position
Lower the vehicle by rotating the ratchet to the left. Lower the jack
completely.
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