Vibration in steering wheel when a bump or other object in the road is hit

check your wheel is on nice and tight. check that the yore has no bulges or damage to all sides.
If everything appears okay take it to a suspension/steering specialist for a look ....sounds like you may have suffered suspension damage.
Who is responsible for the maintenance of that road? I would consider contacting them for an inquiry about possible compensation for the cost of repair, they always fix the road pretty quickly after such inquiries!!!!!
Taking a photo of the offending bump might be advisable

Steering shake ? Begin with have the steering & suspension expertly inspected & vehicle road tested....

If you need further help, reach me via phone at https://www.6ya.com/expert/ralph_2f0886b7d6af32ce

Vibration from about 40-60 mph is usually attributed to wheel balancing, but the onset when you hit a bump seems to indicate play in the steering linkages (tie rods etc) or suspension members and stabiliser bar rubbers but you had that all checked out, that brings us back to the wheel balancing.

Pitman arm and tie rod ends and bail joints.The three main causes of front end shake after hitting a bump.There's so much slop that when you hit a bump it shakes violently from one end of the slop to the other.Very dangerous!You need to get this fixed now!
Get someone to turn the steering wheel while holding onto a front wheel and just watch for stuff that moves.Turn left and right and you'll see what's the worst for wear.The connections at the steering box arm(Pitman) and at the wheels(Tie rods) will be what moves the worst.Hope this helps?Autozone has a kit for the pitman for $100,probably be $600 at a shop.

HEY I HAVE A QUESTION YOU DONT FEEL THE PROBLEM WHEN YOU HIT THE BRAKES AT HIGH SPEED IF YOU DO THE PROBLEM IN WHIT YOU BRAKES YOU NEED TO DO NEW SURFACE IN YOU ROTORS AND PUT NEW BRAKES

Front shocks are week

replace the idler arm that connects the steering linkage to the frame on the passengers side,heavy duty part is about$90.00

change the swivel bearing each side you got 2bearing do prober adjustment.


good luck

you need more caster angle set on the steer.