I just got a 2008 RAM 1500 4X4 with the 5.7 HEMI. It has around 100K on it. I can feel a constant low vibration and I can hear it while driving and it seems not to change with speed but it is never very bad. It gets much more noticeable at 40MPH and 80 MPH when I let off the accelerator and especially when I turn the truck left while at speed even a little it gets very noticeable. I can also feel it in my gas pedal and my floorboard. I just put new tires on and it made NO change at all.

 

Feel it thru the seat, or the steering wheel?

 

Alignment, driveshaft, u-joints, bent wheel...the possibilities are endless.

 

I do not feel anything in the steering wheel and I do not feel it in my seat. it is a very small vibration. just had the wheels check when I got new tires, all were good.

 

not in the steering wheel or in the seat.

 

The fact that you feel it more when turning could indicate a front cv joint