Question: what are the cummins generations?
Answer: 1989 - 1993 Dodge Ram (12v Cummins) 1st gen Dodge Rams seem to have made a comeback in popularity. ... 
1994 - 1998 1/2 Dodge Ram (12v Cummins) The 12v Cummins continued its legacy through midyear 1998. ... 
1998 1/2 - 2002 Dodge Ram (24v Cummins) ... 
2003 - 2007 1/2 Dodge Ram (24v Cummins) ... 
2007 1/2 - 2017 Ram (6.7L Cummins)