Dodge introduced an all-new 6.7 diesel engine during the second half of the 2007 model year, often referred to as a 2007.5. These 4th-gen diesels received many other significant changes including two additional gears for the automatic via the 68RFE 6-speed automatic transmission. Beginning in 2013, a High-Output (HO) version of the 6.7 diesel was offered. Get all the stock replacement parts and aftermarket upgrades your 2007.5-2018 Dodge Ram 2500/3500/4500/5500 needs at XDP.