Are you sure it was a press fit?? Most uppers in chrysler product
trucks & older rear drive cars are screw in. Mabee they changed the
design in the newer ones but if the joint has flat sides around the
top, it's a threaded situation, which would explain it not staying put.
I've welded quite a few of these that were stripped out with long
lasting success but always on the vehicle. The best way to get proper
alignment restored will be at an alignment shop. Good luck.