Dual Mass? Vibration at certain RPMs...

[SuicideAxles]

Past couple of days I've noticed a vibration at around 1600rpm in any gear when driving normally. It feels like a deep bass tone because it's so fine...almost like an exhaust drone/resonance, but coming from the motor/trans. Although it's barely noticeable right now, I want to get it figured out ASAP. I've also noticed that when I'm a little bit more heavy on the throttle there is a more harsh vibration (still barely noticeable) at around 2500rpm. It comes only with engine speed, not vehicle speed, so it's in the drivetrain, not suspension/wheels/tires.

Is this a sign of the dual mass flywheel going out on me? Whats the best thing to do, replace with new, or replace with solid? I doubt this truck has had a clutch put in it, and it's got 172k so it might be smart to change the clutch soon as well.

[SuicideAxles]

Nevermind, the clutch is headed south, found that out today.

[pipelayerjdh]

Go with a single- mass conversion!

[SuicideAxles]

Yep, got a LuK Repset and Luk Solid flywheel for $545 Delivered 2 days ago, dropped the truck off at a drivetrain shop this morning, $300 for R&R Labor and I'll have it back later today. Not happy about spending the money, but I'm glad the truck will be better than it was.