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2nd Gen Ram Tech1994-2001 Rams: This section is for TECHNICAL discussions only, that involve the 1994 through 2001 Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
I have a 2nd gen Ram 1500 with 5.9L magnum. I have the piso lock system and have rebuilt almost the entire np231d due to a grinding noise(best I can describe, loose ball bearings being pushed up and down the sides of the case). The noise was only when the front shaft was in motion. I took it for a test drive to see if the noise had gone away, shuffled through the 4x4 selector and about 10min into the drive the noise went away. About 5min later the mode selector got stuck on 4h.