I just wanted to let everyone know I've thorougly loved my suspension for almost 4 years now. But one thing I'm noticing lately is that either I'm getting older or there's a wacky harmonics going on when driving around 75MPH on concrete freeways.

What's going on is the tail end of the truck feels like it's hitting a harmonics with the seams in the concrete. The faster I go, the more the entire rear-end begins to hop. You can see it's the road by looking at other vehicles but they're not doing the dance like I am. Doesn't do it anywhere else except on these winter-laden roads around here.

Anyone else notice this?

 

mine is smooth as silk, not sure whats up