At 75,000mi you are overdue to replace your struts.
Experts recommend replacement of automotive shocks and struts at 50,000 miles. Testing has shown that original equipment gas-charged shocks and struts degrade measurably by 50,000 miles*. For many popular-selling vehicles, replacing these worn shocks and struts can improve the vehicle's handling characteristics and comfort. Unlike a tire, which rotates a specific number of times per mile, a shock absorber or strut may compress and extend several times per mile on a smooth road, or several hundred times per mile on a very rough road. There are other factors that affect the life of a shock or strut, such as, regional weather conditions, amount and type of road contaminates, driving habits, loading of the vehicle, tire / wheel modifications, and the general mechanical condition of the suspension and tires.