Restless,
I will agree that the 12v Cummins is a legendary engine. Some actually call the '94-98.5 the holy grail of truck engines they're so reliable. I contemplated getting one before I selected a new 2001 24v Cummins. The reason was the drivetrain. I'm still waiting for something major to go wrong besides the legendary Dodge body hardware.
The 1st gen Cummins in a Dodge had very weak transmissions, both manual and auto. They were just not up for the job, especially for ANY up-tuning.
Secondly, the axles, especially the rear Dana 70 was no match for ANY up-tuning of the engine.
Thirdly, the stock 160 H.P. ain't going to get it.
The one overriding great feature of the 1st gen Cummins is the fact that it's all analog, no computerized ignition or pcm. What that means is when the great Solar Flair hits the planet and stops all electronic machines of any kind, the 1st gen will still be going, on and on. That's a comfort.
jefe