80 series problems

I have an 80 series L/C 92 model with exsess of 250 000 kms on the clock. There is a clunking sound in the chasis where the steering box bolts on, when you turn the wheels, if you feel inside the chasis while the steering is being turned you can feel the movement inside. The crush tubes are not cracked on the outside of the chasis and appear ok on the inside. Anyone else had a similar problem, and have any ideas on how to fix.