what is responsible for vibrations at high speed?
Do gears shift on time??
Yes gears shift on time
Nothing wrong with engine mounts??
You will have to narrow it down. It could be wheel balance, it could be wheel bearing, tie rod end, strut or several other items. Seeing that you say it gets worse at higher speed I would look at balancing all the wheels. Even if this does not take care of the problem its still a good idea.
Ok thank you all for your suggestions,i will get back to the house
The drive shaft could be out of balance, a U-Joint could be bad.
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