I am not sure but I think that the 6.5 is a redesigned 6.2 diesel. The 6.2 diesels around here would break the crankshaft in the back main bearing. We found that you needed to change the vibration dampener every 100K and then they would not have this issue. I bet that the noise you had while driving was caused by the dampener going bad. The outer steel will rotate on the rubber isolating layer. This makes it out of balance.
It does not take long for this to happen. I had a Chev 6.2 that I bought new. At 135 K it broke the crankshaft. The engine did not use any oil so I found a good crank shaft and just replaced the crank without disturbing the rods/heads or anything. I reused the dampener as I did not know they had an issue. I drove it two days and it broke the crank again. I thought the used crankshaft I put in may have been bad. So I went and ordered a new one from GM. The parts guy told me to get a new dampener as they had a service bulletin on the issue. I just installed the crank like I did the first one but did replace the dampener. That solved the problem.
I drove the truck for a few more years an then sold it. The fellow that bought it is still driving it and it has 300K on it. HE replaced the dampener at 200K and 300K.
Funny how things happen. Not more than a month after this we got a service bulletin from JD recommending that we replace the dampeners on high houred tractors for the same reason.
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