i have a '99 silverado ex. cab w/ a 2/4 hotchkis drop on it. i have roughly 134,000 miles on my truck now and was wondering if i need to tighten anything up or grease anything. i haven't ever lubed anything up and i have been kinda hearing noises in the suspension but figured that is what happens when you have this kind of mileage and the fact that it's 9 years old. any suggestions?