I felt something gerking my vehicle around while I was driving 30 mph and staight, then it went away. The next day while driving the car I noticed a sound (kinda like bad rotors, grinding) when I took left hand turns coming from the back passanger wheel. Is it my bearings and how do I fix them. IE what tools
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it could be center bearing, if its going bad it can also cause a vibration, make sure you have sufficient fluid in the diff as well, you can also get a noise and vibration from collapsed motor or trans mounts
My 2006 Pontiac Montana SV6 was doing this and since I had just purchased it from a dealer they fixed it for me. They said "there was a bulletin out for this problem on these vehicles". I think it had something to do with cleaning the air flow meter or something similar. It completely solved the problem and also eliminated a "shuttering" that happened sometimes at around 30-40 MPH which felt like tires out of balance, but it was just the engine shuttering from this problem. Hope this helps.
ball joints or bent rim. Does it click or thunk when turning? It may be tie rod as well. You can lift it up and try turning wheel by hand and shake it to see how much play there is. Check the there is a weight on the rim. Every one is supposed to have one.!!!!
It sounds like a wheel bearing. Have the front wheel bearing checked. I would suspect it is the right side, but it can fool you. Another way to determine wheel bearing is while you are driving at a straight line, turn the wheel back and forth, (Make sure a police man is not behind you and thing you are drunk). IF you hear the sound get louder and then softer as you turn side to side, then it is most definitely a wheel bearing. That bearing also has your abs sensor built into it.
Sounds like a problem I had. Turned out to be the vacumn valve that locks the hubs when in 4wd. The car was not in 4wd but the hubs were always locked causing the wheels to vibrate and chatter especially when turning.
Vibrations while driving like you are describing can come from tires that have defects (internally broken belts) (wheel weights that have fallen off) or a bent rim (perhaps from another driver [not you :-) ] hitting a curb) Are the tires worn? Have they been balanced and rotated regularly? You report no vibration in the steering wheel.
Vibrations during braking can be warped rotors or discs (but this doesn't sound like your problem since these kind are usually felt in the steering wheel during braking).
If and only if you feel like you can do this safely,
you can try getting the car up to 55, placing the car in neutral, then switching the "engine off" but leave the "key on" (be warned the power steering will go out but the vehicle can still be steered though the steering wheel will be much stiffer) if you try this (do it perhaps in a vacant parking lot or on an empty road) and the vibration goes away with the engine off but while the vehicle is still moving, then the vibration is engine or transmission related. If this is the case you might hope for maybe a bad engine mount. Bad engine mounts can be diagnosed with the vehicle stopped as well. However, if the vibration remains with the van moving forward but with the engine off, the vibration is likely a problem with the tires or suspension. Try to provide some more info.
If you don't feel comfortable trying the above suggestion, please take the vehicle in to an ASE certified suspension and steering professional for further diagnosis.
Finally, I had a similar situation happen to me today. I was riding with a friend in their van and the vehicle started vibrating more and more around 55 mph. We stopped and carefully checked the front tires (including the lug nuts for tightness) but
found a tire defect. (it had several broken steel belts that caused a bulge in the tire and thus the vibration) We changed the tire and the vibration was gone. Good luck to you.