there seems to be an issue with a friends truck. 2010 ecsb truck. 14bolt rearend. about 95-100 mph there is a buzzing noise in the *** end of the truck. sounds and feels like you hit the wake up strips on the side of the highway. below this mph, quiet. above this mph. quiet.

if it was the driveshaft, it would do it at a lower mph, tires were balanced and rotated last week. factory rear gear and diff. im out of idea's on what to tell the guy

 

What makes you assume this?

 

Mine did it at 110-111 with the 3.23's, now it does it from 80-82. It is the driveshaft, actually common for it to have a spot of vibration that goes right back away, its when it doesn't go away that would indicate a bad problem.

 

I agree that it's probably the driveshaft...the factory doesn't expect these trucks to see the speeds that we put them to. Bring the DS to a DriveShaft/U-Joint shop and they can high speed balance it for your friend