the reason of the price difference is the design of the diff. yours being a newer model. I seen your post on HL as well. Your Ring gear has a lip on it that requires it to be machined down smooth with surface. Some of the 03 model required this as well and some didn't. The DGL will not fit unless this is done. The directions are straight forward for the install. If you run into any problems HL has a tech line that can help you as needed as well as some of the guys on the HL forum. A good machine shop will charge around $30-$40 to do this job.