2010 Lonestar

[DVT873]

Saw axle shaft spline wear as Lonestar describes on a set of tandems back in the 80's except it was all four shafts. I was told by a gear guy it was an unbalanced flywheel. Turned out to be true. Getting the flywheel balance spec wasn't easy pre internet. Had it tested and it was way out of spec. Had it rebalanced. Never felt a thing and no complaints. That engine at that time had a Houdaille viscous damper as standard equipment. It was replaced also. Miles were maybe 80,000.
Rawze posts on here about the Cummins replacement recommendations for the the front damper. Maybe related? Just a guy lost in the archives.