The ram diesel is a small 3.6 I thin V6, the ram cummins is 6.7 litres. Chivy and ferd have a 6.6 and 6.7

Dodge passed on the 5.0 cummins for some dumb reason as there could not be a good reason for that behaviour. Nissan is about to get a serious chunk of the full size truck market like dodge did when they got the 6 cylinder cummins than a decent looking package to put it in in 94. Nissan already has decent looking body by todays standards.