Hello igotacummins!

Looking for some advice.

I've got a 2015 Ram 2500 Cummins w/ the 68RFE and 32K miles. I'm running the RaceME Ultra Tuner with DRD Custom Tunes, full deletes. I have it set on the +30HP and do regular towing at 6K to 10K lbs. I don't hot rod my truck. I've noticed that around 1600 - 2000 RPMs I have a vibration that has a "woo, woo, woo" feel to it, and I notice it most in 3rd - 5th gear. I can feel it in the throttle pedal.

I changed the fluid and filters and the fluid was pink, very little varnish, and no debris.

Wondering if this might be a torque converter and/or friction plate issue?

Would love your thoughts.