Greerco, the flexible coupling rubber is supposed to absorb the torsional vibrations from engine, the frictions plates dampen. Terex usually fitted Centa couplings for a long time. Try to purchase a new part. Your tranny is equipped with a retarder in front of torque converter, isn't it? So the drive should look like attached pic. So, it is not clear to me where the short (welded) spline fits into input drive. I also doubt the weld will last.