Strange Vibration

[erieaddict]

I have a 2002, 2500 HD, 2WD, 6.0. I have the strangest vibration. when the vehicle is cold, it rides as good as it ever has. After about 15 -20 minutes of driving, when i hit the brakes a get a pulsing vibration in the seat of my pants and steering wheel, the truck seems to be bouncing up and down. Almost like a wheel is out of balence bad. at around 45-55 i get the same vibration, but not as bad as when i hit the brakes. At 65-75 it is smooth as silk. Wheels are tight, and torqued. Replaced both wheel hubs/bearings back in October as well as the brake pads. This has me stumped. Any ideas would be greatly appreciated.

[mkurcz]

Have you had your wheels balanced?? Mine was doing the same thing and then a friend told me to get them balanced and then it was all good!!!

[erieaddict]

Will get them rotated and balenced in the AM. Strange thing is, I just went out and drove it tonight for about 2 hours and it ran fine. No wooble or vibration. Most of the time this truck sits other than pulling a boat, 20' enclosed tralier with ATV's or snowmobiles. Just started doing it about a week ago, I could understand the tires being flat spotted from sitting, but it only does it when it is warmed up, sometimes.