I had enough of overheating autos when I had gassers so I've only had manuals with my CTDs. This nv5600 6spd is awesome! I went camping Laborday weekend and passed everything else on the hills except for a few that were pulling much smaller rvs and I still have the stock clutch. I used to drive otr, two stick trucks so shifting this 6spd is nothin'. My knees might make me go to an auto some day but for now... no way! Craig