| Moan or Howl with the vibration at that speed can be indicative of worn gear probs in the rear end.
How many miles are on the truck?
What are your service intervals for the rear end?
When was the cover off last?
__________________  2007 LBZ 3500 LT3 DRW Crew Cab, Sulastics, Putnam XDR 15K, B&W 30K-Turnover GN, Ride-Rite Air...  2008 LMM 3500WT DRW Crew Cab, 8 'Flat/GN, Workforce Alum Toolbox, Ride-Rite Air, Sulastics  2006 Chev 6.0L/4L80e 3500 WT DRW Ex-Cab, 9 'Flat/GN, Ride-Rite Air, Bilsteins, A/T Revos, TTT towing mirrors. Use-ta Haves 2005-LLY 3500 LS DRW Crew Cab, 2002-LB7 3500 LS DRW Crew Cab  I Live my life in such a way that when my feet hit the floor in the morning...Satan shudders & says "Oh shit, he's awake!" |