I have a RAM 1500 07. There's a knocking noise behind steering wheel on small bumps. There's the same knocking sound while making small angle turns of the steering wheel with turned off engine. Lower and intermidiate steering shafts are replaced with new oem. Steering gear and linkage are in great shape and were checked. The noise comes right behind steering wheel. Are there any bearing in the steering column that could be worn out and replaced?