I'll go ahead and add to Les, and call BS on the whole tirade about the 3176's.  We have only owned about ten of them during the last 13 years and the major work we have done has been routine bearings and one injector and one ECM.  One also had timing gears while under warranty.  Their were some problems with the first couple series, but there have been a hell of a lot more good ones built since those then there were of them.  Almost every large frame Challenger has a 3176 or 3196, as does a lot of Cat industrial equipment.  The trucking industry is the only segment where they renamed the series because apparently people can't figure out that there are things improved between serial series. 

BTW, the engines are  Cummins.  Cummings is the name of an entertainer.