Firestone 2535 Ride Rite Air Helper Spring<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>For 2011 -2012 Ford F-250 (Diesel 4x2 &amp; 4x4)， F-350 (Diesel 4x2 &amp; 4x4)， F-450 (4x2 &amp; 4x4)</li><li>Ride-Rite and Sport-Rite Air Helper Springs utilize a pair of convoluted or tapered-style air springs</li><li>These air springs are capable of 3000 - 5000 pounds of load carrying</li><li>Under no circumstances do we recommend exceeding the manufacturer's Gross Vehicle Weight Rating (GVWR)</li><li>Ride-Rite &amp; Sport-Rite， Air Helper Springs can be installed on most light trucks， RVs and vans， Ride-Rite and Sport-Rite Air Helper Springs are installed between the frame</li></ul></div><img src="http://ecx.images-amazon.com/images/I/412klrvqsgL.jpg" noproxy>