its funny you'd ask that, i just installed one on mine today. its a hellwig 7651. but none of the trucks came with one from the factory. your going to have to go aftermarket. there are more out there than hellwig. hotchkis makes one, i believe bellteck makes one and there are a few others. but so far from my experience, (just a few hours of driving) it has made a world of difference just around town.