Suspension Noise problems of the 2000 Chevrolet Blazer

We have a 2000 chevy Blazer VIN 1gndt13w1y2225372. Since ownership the vehicle has been expected. My sister has complained numerous times about issues with rattles, squeaks and body issues. We have noticed early in the vehicles life the amount of rust this Blazer has on the underbody. This has been the issue of some of the noises. Recently, she complained again of a suspension noise while stopping, turning or hitting ruts or holes in the road. I inspected and lubricated problematic points that we addressed in the past. The noise would come and go. Finally, she mentioned a feel of control loss while braking and making turns and the noise. She mentioned the noise was so loud people would stare or turn heads. Upon my inspection I was shocked and never have seen this problem on any vehicle. The rear shackles that hold the rear leaf spring to the frame had completely rusted through. Thus allowing the leaf spring to float freely on the frame rail in rear. This shackle allows the leaf spring to move forward and backward during suspension flex. In addition, this stabilizes the rear end and keeps everything in place-consult a mechanic for specific function. I have dealt with many cars in my life as well as trucks. Never, have I seen this rust issue in any vehicle-chevy to note as well. I am demanding a response to this problem and I will further contact traffic safety about this issue. I'm sorry, but this is a serious issue at hand. This Blazer has around 73000 miles and from the outside paint and interior looks in excellent condition. However, when looking at the underside carriage, engine compartment and the integrity of the door hinges (especially drivers door) it is a mess. I am expecting a reasonable explanation on this issue and appreciate your input. *** this is the same letter I sent to gm.

Loose rear stabilizer links and misaligned suspension caused the vehicle to make noise when driving over bumps. Nlm.