Dodge 2004 Ram 2500 Owner's Manual page 303

WHAT TO DO IN EMERGENCIES 303
When changing a rear wheel, assemble the jack drive
tube to the jack and connect the drive tube to the
extension tube. Place the jack under the axle between the
spring and the shock absorber with the drive tubes
extending to the rear. Connect the jack tube extension and
wheel wrench.
Before raising the wheel off the ground, make sure that
the jack will not damage surrounding truck parts and
adjust the jack position as required.
NOTE: If the jack will not lower by turning the dial
6
(thumb wheel) by hand, it may be necessary to use the
2500/3500 4X2 Jacking Location
jack drive tube in order to lower the jack.