Well got my truck at last. My truck has the 6 speed manual with 444 gear. I had a 07 3500 with a 6 speed also. It was 373 gear. Well the 5500 tachs little over 2k at 60 mph. The ride is little harsher but not that bad. The truck tows well but my 3500 did to. So far it getting 2mph better fuel miliage than the3500 wich had problems with the DPF.