Join Date: Nov 2008
Location: Winder, GA
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PMR = Powdered Metal Rods. This is in contrast to Forged Rods which were used in earlier trucks.
As to identification, that's tough. Based on the symptom and condition in which it occurs, I'm guessing worn bearing. This can usually be identified by small metal flakes in the oil. Another method is to take a big socket wrench on the end of the crank and rock it back and forth. You can often "feel", or in extreme cases even hear, the rod end clunking against the crank.
Again, this is an extreme guess. I have no idea what the sound is like and it could be something as simple as a collapsed lifter, cracked flexplate (flywheel), loose converter, or anything else. I'm simply going off the driving condition and description of the sound.
Friends don't let friends drive JUNK
2001 7.3L - Stage 1's at 399 HP - Just a lonely Daily Driver
2004 6.0L - Studded - 440 on #2 Only - 482 on Water/Meth - 12.961 @ 102.6 MPH