[guys]

Ironically, my 2002 F250 4X4 7.3 just started doing this last week as well. Starts around 40 under acceleration then goes away around 70, unless I lift, then it goes away right away. My original thought was rear u joint, but going back and checking different internet threads, I see hundreds of people that have changes tires, u joints, balanced driveshaft, balanced wheels, replaced rotors and bearings, still have it. I'm running 22's on 37's and the tires have about 3000 miles on it, truck just turned 200k, I did a full service for its 200k birthday, no issues, then a couple weeks later I get this vibration. It's not bad, but when it never had it before it just bugs the crap out of me and is robbing me of my enjoyment of driving the beast(Along with Bidens great fuel pricees)! Hopefully, someone has found a solution?? I'm going to try the rear driveshaft and if that don't do it, I may just turn up the stereo! I'll post any results

 

[guys]

Just start lately but drives fine to about 40 mph then a slight shake but, but from 45 up to 55 hard shake. Once I get to 55 mph it stop and drives great. I am can slow down to 50 and still drive normal. Down to 45 shake comes back. I had both front tires replaced and same thing happens. Any ideas

Link to what one member says is due to lack of proper balancing. Not sure I agree 100% as a former Bridgestone employee and current car/truck builder. He's right about the Hunter 9000 though, that's one of the best machines out there. I know what a tire vibration feels like and a tire vibration shouldn't change whether you are under load or not. Tire vibration should be the same in neutral at 55 or under load at 55.
However, checking all the things he listed I agree could cause a similar vibration. But not what I'm experiencing, since it instantly goes away off throttle. Seems to be more driveshaft related

Shaking at and getting to 70 mph | The Diesel Stop

 

[guys]

UPDATE---My rear U joint on the driveshaft was shot and the carrier bearing was looking like it was next. Took it to my favorite driveline shop who busted out a complete one-piece aluminum driveshaft to replace the two-piece. Slapped that in and good to go, no mo vibration! Smooth as a baby's bottom at all speeds. Even lost the off the line shake I thought was my tires. Stoked.

 

[guys]

Dang that's cool!

Right?? I told the driveline guys I was going to have to go under and repaint everything now, cuz the shaft looks so sweet, it makes everything else look bad! My wife said I'm ridiculous, no one is going to notice! I said rubbish! If they know, they'll know!!