1997 Acura CL knocking and tearing noise

Suspension problem
1997 Acura CL Engine Size unknown Four Wheel Drive Manual 140 miles

I have been having problems with my car lately, every time I speed up, I hear this knocking and tearing noise. I don't know if its in the engine or in the wheel itself. I had it checked by a mechanic and told me that it might be on my Acura CL axle. I didn't understand much of what he's trying to say since he speak poor English. How will I know if its really the axle? And is this difficult to repair? Please help! Thanks!