Question about 1998 Chevrolet Suburban

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I have replaced all four tires(Michelins), which have been "road force balanced", front end aligned, new brake drums (last 30 days), and new shocks, but the vehicle has a definate vibration over 63 mph and increases up to 70 mph. Shop is puzzled as am I. Any suggestions

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Hi

you might just want to check to see and make sure the insides of your rims are clean too. snow or dirt that is caked on the inside of the rim will cause this. and by inside the rim i don't mean in the air chamber of the wheel, but just on the inner circle of a wheel.
If this doesnt work, look over every tire very carefully making sure you see no humps or bumps. You could have possibly broke a belt in the tire.
there may be somethin stuck to one or more wheels, causing imbalance. Take the care to a self-serve car wash and spray the wheels from underneath the car and in the wheel wells.
OR
The wheel bearings may also be going bad in the front end. Bad wheel bearings will cause vibration in the engine compartment, leading to a rougher ride, and usually a loud rubbing noise. Unrepaired, bad bearings will eventually cause your wheel to seperate from the axle. If this should happen at high speed... the axle will dig down into the concrete and send the car airborne.
A very common problem is faulty tires or incorrect wheel balance of the front tires. Check for a bulge or a wear on the tires. If all is ok..get a mechanic to check your wheel bearings. Check for a broken strut assembly or shock absorber. Check for tire rod bushings and the balance rod. Check complete front suspension.

hope this will work
all the best
regards

Posted on Jun 21, 2009

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I see you have done quite abit., and still no results? Answer this question for me. Is this vibration sound rythmic, like up and dow?

Posted on Jul 13, 2009

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2 Answers

I have a 99 expedition I had the tires changed I put smaller tires on it to get rid of the mud tires now my front end shakes like it has 2 flats


more than likely there is some component damage ,linkages, tire rod ends, vibration dampener the shock looking thing under front end , connecting left to right on steering link.

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I have a 2003 Volvo wagon - V70. It has a nasty vibration in the front right-hand side when you go over 80klm/hr. I have just replaced all four tyres and had them balanced and aligned. Any idea what&a


These cars, with engine and steering all done up front, can be rough on the steering and suspension components.

You want to look at and/or replace the end links, the swaybar links (not likely your problem, but probably needs replacement) and the strut bearing and the spring seat.
The spring seats are superseded by the XC90 version these days. It's far sturdier and lasts longer.

Oh, balljoints too. All these parts are relatively cheap and you can do it yourself if you have the tools and a lazy weekend.

You might also want to check that your brakes aren't touching/binding. I don't remember if these are the sliding calipers, but if so, they could stand a cleaning re-lubing.

If you still think it's the tires/wheels, you can find a place to have them "road force balanced" which puts weight on them to detect defects in the tire that only show up under speed and load.

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What about the shock absorbers? Including the struts?
Stiff shocks will often create flat spots on tires over a period of time. Were these replaced?

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My 2001 has had a front end vibration since the day I bought in. Have tried new tires, new rims, balancing,alighnment...I give up. Any ideas?


Have the tires road force balanced. it will put a load on the tire when its balanced and any hidden tire defects will show up.

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FRONT TIRE BOUNCE AT 40-50 MPH


relace your shocks. the design of any dampner(strut or shock design) is to return the wheel to the road for handling and safety. when the shock is worn out is with continue to bounce like a basketball. it has no more strength to return to wheel to the road. a common misconception is that they are there to absorb, not true. the springs or torsion bars are there to absorb and create ride height. the shock does nothing more then return the wheel to the road. simple and inexpensive.

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It sounds like you may have more than one problem here. First I would investigate Front End Alignment and ALL Steering/Suspension components for excessive wear and/or looseness. Second I would Inspect the Brake Rotors and Pads for uneven wear. Third I would check the Tires for uneven wear and balance. Many things can cause these symptoms: Worn out Ball Joints, defective Shock Absorbers/Struts. Worn out Tie Rod Ends, Idler Arm, even the Steering Gear Box can be part of the problem. Brake Rotors and Tires can be out of Balance with either one causing the problem over 60 MPH. I strongly suggest having your vehicle inspected by an ASE Certified Front End and Brake specialist immediately. It is very dangerous to drive a vehicle with these symptoms.

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Shakes at high speeds. 4 New tires, all road force balanced. Wheels aligned.


check your tail sharft uni joints if it is them you will feel it more when you jump off the gas

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try 35psi in tires, max air pressure on goodyear tires is 44psi, chevrolet recomends 35psi

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