I have a 2006 Dakota four wheel drive 3.7 engine automatic. it happened about one year ago and them last weel. The truck started vibrating about 60 mph and then even when I hit the brakes it seemed like the rotors were warped. the vibration could be felt though out the whole truck. I went into the doctors office and came out and went down the same highway and it was ok, no vibrsaion at all and has been ok ever since, The brakes are new and are very smooth when I hit them, Help, Thanks, JIM

 

If it's fine now, may have been something in the road surface. Kinda hard to fix something that is no longer broke.

 

I had an intermittent issue with my parking brake sticking that gave me similar symptoms.

 

It did it on a very good road and for about 5 miles till I got to doctor

 

No mud,snow or ice caked up to the wheel?

 

 

check the front drive shaft, a lot of times the boot gets a tear and the bearings rust and blow apart causing the shaft to bounce around

 

There are a few possibilities to look at:
- a rusted sticky parking brake linkage in the drum assembly. Common.
- a leaky wheel cylinder (rear brake piston)
- driveshaft u-joint going bad
- tire balancing, possible wheel threw a weight
- worn shocks

Checking through each of those, process of elimination or correction, will get you sorted. In the same case of my son's truck, the issue was the rear shocks were pretty well done. No damping. One wheel was also slightly out of balance. So down the highway any little bump or tar line setup small shudders and resonant vibrations. Fixed it by installing Rancho RS5000 all way round. Smooth like a magic carpet ride since.

Hope that helps!