I have an earlier 2004 Ram 3500. I took it to a local diesel performance/racing shop called Diesel Nut. I told the guy there I wanted to pull my 16000 lb 5th wheel trailer, and wanted an engine brake. He recommended upgrading the transmission with a new high performance valve body that puts more pressure on the disks, along with the D-Celerator exhaust brake. I can say that it definitely shifts rougher than before, and the exhaust brake has worked OK.