When a rear frame crossmember rusts out or breaks from impact damage on certain Chevrolet Silverado and GMC Sierra trucks, the usual repair options are to fabricate and weld on a replacement if you have the tools and skills to do it, or risk installing a salvage yard part. This weld-on Dorman OE FIX rear frame crossmember is designed to match the fit and function of an original equipment crossmember and saves the time and hassle of fabricating a replacement from scratch. It's manufactured from durable steel with a corrosion-resistant coating, and includes a convenient grounding lug.