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Old 04-28-2011, 06:13 PM
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rearend noise and vibration

i have an 01 gmc sonoma ext. cab truck. and somewhere in the rear of it there is a noise that sounds somewhat like an airplane running. it has a 2 piece drive shaft. so i replaced the carrier bearing, made no change. i have greased both velocity joints, no change. i have even removed the back half of the driveshaft and had another truck tow me and it is still there. Ive changed the grease in the differential and everything looks like new with no slop anywhere. i have changed all 4 wheels and tires and still no difference. what are the other possibilities it could be before i change the whole rearend?

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Old 04-28-2011, 09:24 PM
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what about the wheel bearings? is this a 4wd or 2wd? 4 or 6 cyl?
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Old 04-29-2011, 08:39 AM
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4.3, 2wd, im gonna take the brake drums off on it today and see if i can see anything.
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Old 04-29-2011, 10:34 AM
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Common Pinion brg problem. Remove the axles and check for a bad axle and or bad brg. If the axles are good there's a good chance you have some bad brgs in the diff.
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Old 05-10-2011, 10:49 AM
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update: i changed the complete rearend to find out that it wasnt the problem. i guess ill have a 1 piece driveshaft made now and see what that does.
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Old 05-10-2011, 09:11 PM
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Quote:
Originally Posted by runn141
i have an 01 gmc sonoma ext. cab truck. and somewhere in the rear of it there is a noise that sounds somewhat like an airplane running. it has a 2 piece drive shaft. so i replaced the carrier bearing, made no change. i have greased both velocity joints, no change. i have even removed the back half of the driveshaft and had another truck tow me and it is still there. Ive changed the grease in the differential and everything looks like new with no slop anywhere. i have changed all 4 wheels and tires and still no difference. what are the other possibilities it could be before i change the whole rearend?
when you disconnected the drive shaft and had the truck pulled and the noise was present, did you have the trans in gear? or park/ neutral? is the noise speed related? does it get louder as speed increases? or does it go away at all?
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Old 05-11-2011, 11:19 AM
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Quote:
Originally Posted by tnsmith10
when you disconnected the drive shaft and had the truck pulled and the noise was present, did you have the trans in gear? or park/ neutral? is the noise speed related? does it get louder as speed increases? or does it go away at all?
it is a 2 piece drive shaft, i had the back half taken out. and left the front from the trans to the carrier bearing. i pulled the truck with my dad driving it. he said it was still there so we figured it was the rearend. i think he had it in neutral im not sure. but it does get louder and faster sounding as the truck gets faster. im gonna do it one more time towing with the whole driveshaft out this time in park. if it is still there then the only other thing it could be is the front wheel bearings.
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