45 MPH lifted truck wobble/bounce...

[fire9199]

I was wondering if anyone has had a problem with their lifted truck bouncing at 45 mph. I am on my 3rd superduty and all 3 have done the same thing. At approx 45 mph the truck starts to feel like a tire is out of balance or ??? It only does it at 45 mph, if I increase speed or decrease speed it goes away. I just put brand new 37" hankook mt's on factory 20's. So it shouldn't be the tires but? A mechanic at ford told me it's normal and they make a weight that goes on the reciever to balance the truck. Is that accurate or ???

[Clayton1985]

Mine did it stock and does it lifted as well.

[PSDfreak]

I heard its a characteristic of a CCLB truck...I have it, seems like it comes and goes...have not heard of a weight for the hitch