Just so The Warden is clear, once the OUTSIDE axle bolt is properly torqued, you should have NO play between the outside mating surface of the "can" and the wheel. Conversely, once the C clip is installed there should be little if any play between the inner most mating surface of the "can" and the diff. When the C clip is in place AND the axle bolt properly torqued you CAN grasp the axle between the two cans and move it inward toward the diff and outward toward the wheel. This provides the travel of which DMorrison was speaking.

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84 300DT Puke Yellow. Totalled after 438,000
84 300DT Orient Red. 169,000 (actual mileage may vary)
2002 Explorer EB (wife's)