At speeds of 60mph or more when i go over bumps on road that are not hit at the same time whith the front tires the fronts end vibrates violently and I have to slow down to get control. When both tires hit bumps evenly ie. together at the sme time this does not happen.
New tierods have been installed and have helped somewhat but vibration still occures.
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check you springs you may have a broken spring also jack the wheel up one at a time and check the bearing hands 9 and 3 pull side to side and then up and down at 12 to 6 any excessive movement and the bearing needs changing. do this to both wheels. also check the anti roll bar rubbers all 4 of them check for splits or wear this can also make a clunking sound on bumps of any size. failing all these you may need to have your disc's checked as they may have become warped can happen if you use them alot ie hills, sudden stopping
Could be a wheel, tire, or axle shaft. You could rotate the tires front to back and see if the vibration moves. If it does the problem is one of the tires or wheels. If it stays in the front, its probably one of the axle shafts. It could also be a hub bearing or something loose in the suspension. But a loose suspension part would normally show up when you hit a bump rather than on a smooth road.
When front-end vibration is more apparant at higher speeds, this usually indicates your front wheels are badly out of balance. This can occur if you regularly drive on unsealed roads, or the wheels have hit the curbside etc.
Have your local tire fitter balance your wheels for you - this involves clipping tiny weights to your wheels, to keep the wheel centred during rotation.
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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.
You probably have a worn tie-rod. Jack one side of the car up at a time so that one front wheel is off the ground. Grab the wheel and try to turn it back and forth. You should not feel any play. When you find a wheel with play, reach around the wheel with one hand and grab the inner tie rod and hold it still while pushing and pulling on the wheel. If the play goes away, replace the inner tie rod end. If it does not go away, replace the outer tie rod end.
Whilst not familiar with your vehicle, in mercedes it is called highway hop, and was caused by the universal joint(speed related) that goes to the gearbox,they also added a damper to the diff (weight, frequency related)), , in regards the leaf springs, unless the spring hanger bushes are totally knackered it shouldn't cause problems.
2)unijoints or excess movement of the gearbox output shafts
3)excess pinion movement of diffs(where the uni joint bolts on)
5)?bent axle (rare but they do do it)
6)swivel bearings in the front diff
Not sure as to your front end set up, but this may help?
It is likely both your track bar and the lack of a steering gear box stabilizer. The bushings on your stock track bar can be replaced with polyeurethane or metal bushings which will help curb the problem.
The steering stabilizer attaches to your steering gear box and your frame allowing the steering to be more stable. I have put both on my truck and it drives like a caddy now as a result. If I had to choose between the two items, my money would go to the steering stabilizer first. I believe I bought mine here:
Hope this helps
Here's the fix. Have all of the front end components checked for excessive play (tie rod ends, ball joints, pittman arm, and steering box) and replace any components that are worn. Also, REPLACE the steering stabilizer! It looks like a cross-mounted shock absorber attached to the frame and your steering linkage. These wear out and cause the exact condition that you've experienced.