I get a serious uncontrollable shake in the steering above 80 kph. if I hit a bump or new road surface. I have replaced the drag link, stabilizer shock, and all other joints related. What else could cause this? '93 Jeep Grand Cherokee 4.0 litre 6,,,,,,,,,,,,,,
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You have worn parts in your front suspension. There are lots of possibilities depending on your particular car but common causes could be: steering and/or control links, worn bushings, worn steering assembly, worn shock absorbers or struts.
Best to find a trusted mechanic and have it checked out - it could be dangerous!
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
This is a very typical issue on lifted vehicles being driven on the street. It is important to know that when a vehicle is lifted, the steering and suspension geometry change and characteristics will change as well.
My first concern would be with front wheel alignment. If front caster angles are too severe, the will fight each other over rough surfaces and cause the truck to wander or feel like a shake.
Also, front toe angles are crucial for proper tire wear and stability.
Have the front end aligned and checked. If there are no alignment issues, focus on the shocks and that steering stabilizer. Was the problem there before you installed the stabilizer? If not, check it for proper oil/ gas charge.
Weak or worn shocks will cause the tires to bounce and leave the road over bumps. Since the truck and been lifted, make sure the shocks are the proper length. If they are too short (even by as little as 20mm), they cause rebound problems and make the opposing side overcompensate with a bouncing effect.
Your steering damper that controls the steering system's lateral motion is a shock absorber mounted to the steering components under the vehicle. This is most likely the cause of the shaking. Also inspect the tie rod ends and all other suspension systems for possible failure.
The damper looks like this with the replacement hardware;
Haha the death wobble replace the steering dampner or shock on the lower tortion bar of the suspension with an heavy duty upgraded one. Not a difficult repair check the tortion bar bushing for play. But the death wobble is caused by the steering shock. Seen it a lot fixes it every time. Hope the info helps rate it please.
This usually indicates a problem with the suspension components. Check for play in front end suspension, 1st thing I would check would be the steering damper, it's often overlooked, and could be the cause. If that checks out ok, jack up and check for play in wheels, which could be caused by worn ball joints, tie rod ends, wheel bearings. A lot of possibilities, generally play in any components can trigger the shaking you're experiencing when hitting a pot hole or bump. Good luck!