Truck bounces/vibrates 50 mph. HELP!!!
Junior Member
Joined: Jul 2020
Posts: 5
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Going to have another mechanic drive it and see whats wrong with it.
Junior Member
Joined: Jul 2020
Posts: 1
Likes: 0
I have a 2010 ford f-150 stx extend cap 4.6L. Normally between 50 to 55mph the truck bounces. 60 to 75mph the truck is fine with no vibration. Once I get over 75 mph the bouncing will start again. I have tried everything. The tires have been balance twice. I have placed the truck in neutral around 55mph and it still bounces as it slows down. All the weighs are on the drive shaft. Could it be a busted belt in a tire or is it a drive shaft issue? I have read a few things about drive shaft issues? Also, the temperature outside does affect the bounce/vibration. There is less bounce when cold but more bounce when warm. Thanks
it is likely the drive shaft out of balance. i have a 14 screw fx4 and had a bad vibration at 45-55mph and rotating and having tires balanced did nothing. i have extended warranty so i took it to dealer and they used some maching while driving it to measure the vibration at like 27hz and said it was the drive shaft out of balance and it needed replaced. warranty covered and they replaced it and the vibration is completely gone.