Most normally tire balance, poor tire condition, and the u joints should be checked as well. I'm positive it's one of the three.
Tires may need to be balanced.
problem with your transmission in 5th gear
My guess would be wheel balance.
Normally this is caused by a tire out of balance or a bent wheel.
i would really like to know myself
possibilityThe car is out of alignment or you have a wheel out of balance.
Tires or wheels out of balance? Bent wheel? Bad cv joint?
have your front tires rebalanced.
Tires out of balance, bent wheel, or defective tire.
Wheel balance, Worn steering parts, Worn suspension parts, Tire damage,
Tire our of balance or bent wheel. Have your tires rotated and balanced.
Most common reason is improperly balanced wheels, next would be alignment but that usually causes a pull to the left or right.