Dry transaxle?

[Nadiamarie22]

I have a Volvo s40 2007. I just changed the cv axle on both sides and when the guys were changing it they said it was dry and that fluid should have came out. So I asked another mechanic about this problem and he said to just put grease in it and it should fix the problem
My car vibrates on the passenger side when I go past 30 mph and I've been told it was the axle making that sound. So I changed both axles, wheel bearings, struts, tie rod ends and sway bars. Does anyone know what the problem could possibly be?