Sounds like your Steering rack is starting to show signs of wear... Power Steering Stop Leak is totally effective at removing hard spots and tightness in worn rack & pinions. To correct worn rack and pinions, empty the reservoir and refill it with Lucas PSSL (usually 12 oz.). Results are immediate and long lasting. 12 OZ. BOTTLE
Lucas Power Steering Stop Leak
Product# LP10008
Detailed Info Price US $8.70 Qty
The only other thing you could try to do is to remove the rack and rebuild it.. I think that there is a DIY write up of rebuilding it on this site