Review on ACDelco Professional 45H1203 Rear Coil Spring Set: Reliable Suspension Upgrade for Optimal Performance by Jason Laney

I wish I hadn't waited so long to replace them. Our '04 Sienna has 250,000 miles on it and I found that the rear springs in the lower bracket were broken, most likely due to road salt corrosion. Regardless of the failure, the springs wear out slowly, so we don't notice any degradation in ride and handling. After replacing the springs, the ride became more stable and handling slightly improved. The work is not difficult - there is a lot of information on the network. I am very happy with the purchase and would recommend getting it down to the 200,000 mark as it makes a huge difference in security.