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Today on our 2012 Toyota Sienna, we'll be installing the Firestone Coil Rite Air Helper Springs, part number F4155. To begin, we'll first go ahead and measure our ride height with the manufacturer's suspension and no weight added to the vehicle. As you can see, to the top of the fender here at the rear, it's 29-3/4 inches. Now, we'll go ahead and add approximately 760 pounds of weight. We'll take… see more >
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