I have a basement bathroom concrete slab with a 3" metal pipe can hou still buy shower drains that will thread onto the pipe the old one has no threads left

i have a basement bathroom concrete slab with a 3" metal pipe can hou still buy shower drains that will thread onto the pipe the old one has no threads left

Best I can come up with is a 2" threaded shower drain. Can the 3" be bushed down? Check it out at; 2", Shower Drain, 2" Female Pipe Thread Outlet, 3-1/2" Stainless Steel (http://www.idealtruevalue.com/servlet/the-73348/Detail)
Good luck, tom