Question about 1999 Chevrolet Silverado 1500

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1999 chevy silverado z71 5.3 ujoints just got changed loud squeal in back sound like center of drive shaft / no vibration when driving, no play up/down side to side on drive shaft,is it in the rearend or the wheel bearings is the sound traveling thru drive shaft orienting from rear end or can the wheel bearing travel sound thru driveshaft

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  • erock75 May 20, 2010

    it was the bad ujoints i just replaced the one in the rear was so stiff it took 2hands to swivel it i didnt mean to reject your idea was a mistake sorry and i only have 2 ujoints onre the rear shaft , hears a q for ya where can i find a cheap engine builder

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I would suspect bad driveshaft hanger bearing - to confirm, jack up back end of truck and hold up with jack stands. have someone in the truck to accelerate to the speed where you hear the noise, listen for the noise - a stethescope is very useful for this. good luck!

Posted on May 10, 2010

  • Geoff Walton May 10, 2010

    you have rejected my response, but it is the next logical step in this diagnostic. how else can i help? these hanger bearings are common failures and do make the described noise!

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I agree with the respose from ottawa tech, but I would like to add that it could also be axle bearings, I learned this the hard way on an s-10 with companion joints. Replaced all u-joints as well as springs and cups, still had the same noise, sounded like it was coming from the center of the drive shaft, turned out to be an outer axle bearing (don't ask how the sound travelled to there???????). After all this my customer told me that the rear end had gone dry and he just topped it up. I did what I was told to do by changing the u-joints so he wasn't mad but both of us could not figure out why we could hear it in the drive shaft. replaced left outer axle bearing and the noise was gone..
Go Figure Dwayne

Posted on May 18, 2010

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I would pull the rear differential cover and check the ring and pinion out. See how the fluid looks and if there are any metal shavings in the fluid. Could also try pulling the wheel bearings and packing them with grease. With out hearing the noise not much else I can tell you.

Posted on May 18, 2010

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