Chances are the problem is due to an error on your installation. That means it may take no more than taking it apart, finding there mistake and putting it back together right. One end or the other of the axle isn't engaging. Put the parking brake on, start the engine and put it in drive. Look at the axle you replaced. If it is turning, but not the wheel, the problem is in the CV joint of hub. Check it. If the axle isn't turning, the problem is in the other Cv joint or where the axle engages the transmission. Take it all apart again, and carefully put to back together. The grinding may be coming from the axle turning where it shouldn't. If it hasn't ruined anything, you not have to spend anymore money.
A book might help. I find the Chiltons or Haynes from the parts store or library inadequate, but may have to do this time. Long range, try Ebay or
www.factorymanuals.com. You may be able to get a real shop manual for the price of a Chiltons.