Check at almost any autoshop and iam almost sure they will know about this legendary defest on suburbans it is some tipe of shaft under dash board and the engine my sub had it before i bought it but the dealer fixed it in about 2 hrs,i had a sub 2001 with same problem and dealer replaced it too it will go away for about a year and then you will deal with it again,since they replace it with the same cheap part,check out this website www.chevytalk.com and you will find a replacement part that will last longer.
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When I drive at high speeds I hear a funny siren sound with blue lights flashing :) Seriously though, the power steering fluid may be aerated or low and moaning which can make the steering wheel feel odd, as in vibrating . See what your fluid looks like and the level of it.
if you feel the pulsation in brake pedal when stopping. its a warped brake rotor thats causing it. for bad cv joint symtoms--- Unusual noises when making turns. As you are driving on the road and you make a turn at the corner, if you start hearing unusual sounds coming from under the car then this is one of the symptoms of a bad CV joint. These noises will sound like something is clicking beneath the car every time you turn the steering wheel. Evidence of a damaged boot. Steering wheel feels heavier. The steering wheel will start to feel tighter and heavier and you can hardly make simple turns to the left or right. In severe cases you might even feel heavy vibrations like you are driving down a rocky road.
LOOk on the top of the steering box in the middle there is a stud with a nut threaded onto it this is the adjustmemt for steering wheel play . Loosen the nut and take a stright head screw driver put it in the slot in the stud and turn it in . rembember you should have an inch or so free play in the steering wheel this will tighten it up then tighten the nut back down
Have a mechanic check lower control arm bushing at the rear of the control arm.It is a horizontal bushing retained by a vertical bolt clamping it to frame.The tire will move more forward and back more than it should during braking. canuck mechanic.
might be one of your catalytic converters clogging up. usually happens after engine has been running for a time? mostly heard when you let off the gas pedal? does the noise appear to be coming from the transfer case area? i thought i was having tranny problems, but turned out to be one of the catalytic converters. whew....