You also need to take a look inside of your differential. There is supposed to be a "C" clip that retains the axle in the differential. If that fell off; where did it go? Also between the axle and the differential there is sometimes a spacer that could have fallen of and onto the road somewhere.
Even on a good axle that only has torn boots the boots and clamps have a heafty cost which for me was not worth the bother leading me to by rebuilt axles that at the time were around $78 each (a year ago). Someone recently bought new (made in ???) axles for around $99 from NAPA and there are also rebuilt axles for around the same price. Either way you get a warrenty.

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84 300D, 82 Volvo 244Gl Diesel