If you have internal steering its probably the tiller arm on the swivel pin that goes into the gimble ring, its a square type fit between the pin and tiller arm, they eventually wear loose and are alot of work to replace. This is yet another reason that external steering is so much superior even if you aren't running a hi-per application, this can't happens with rams.
We just had the trim pins between the ring and gimble housing go bad on a 30 hallett with eternal steering which wasnt too bad to replace to the heavier duty pins, just pull the drives to change those. But the boat is 12-13 years old and runs about 85-90 with a couple big Brummett Motors, so it has been under alot of stress.