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Rear End Knocking Noise

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Old 09-10-2012, 12:35 PM
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When driving or even just moving out of the drive way, I have a loud ;popping noise coming from the right rear. I am thinking the wheel bearing is out, any heads up or info would be appreciated.

Thanks,
Mike

any help??
 

Last edited by swartlkk; 09-10-2012 at 10:22 PM. Reason: *COMBINING CONSECUTIVE POSTS* Please use the edit function to add additional information to your post if another member has yet to reply. Rules are Rules.
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Old 09-10-2012, 03:44 PM
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Year and model?
 
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Old 09-10-2012, 04:40 PM
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1998 GMC Jimmy

i'm really needing some help guys. I need to fix it like asap
 

Last edited by swartlkk; 09-10-2012 at 10:22 PM. Reason: *COMBINING CONSECUTIVE POSTS* Please use the edit function to add additional information to your post if another member has yet to reply. Rules are Rules.
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Old 09-10-2012, 07:54 PM
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All the time or intermittent? Any difference in acceleration or braking? Is it affected by bumps in the road?
 
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Old 09-10-2012, 10:20 PM
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it's all the time. It seems to get louder when i'm accelerating and kind of mellow out when i'm just coasting. I haven't hit to many bumps since the noise started. I got the bearings out, they were good just didn't have any grease but i did find that all of my differential gears were chewed up and where tumbling around so i think that may have been the issue
 
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Old 09-11-2012, 05:01 PM
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did i put this in the wrong category or is just no one responding
 
  #7  
Old 09-11-2012, 05:06 PM
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Rear Drive Axle Noises
Gear Noise

Gear noise or whine is audible from 32–89 km/h (20–55 mph) under 4 driving conditions:
Drive– Acceleration or heavy pull

Road Load–Vehicle driving load or constant speed

Float–Using enough throttle to keep the vehicle from driving the engine, the vehicle slows down gradually but the engine still pulls slightly

Coast–Throttle is closed and the vehicle is in gear

Gear noise most frequently has periods where the noise is more prominent, usually between 48–64 km/h (30–40 mph) and 80–85 km/h (50–53 mph). Gear whine is corrected by either ring and pinion gear replacement or adjustment, depending on the mileage of the gearset.

Bearing Noise


Faulty bearings produce a rough growl or grating sound, rather than the whine typical of gear noise. Bearing noise/hum will pulsate at a constant vehicle speed. This indicates a bad pinion or a bad rear axle side bearing. This noise can be confused with rear wheel bearing noise. Inspect and replace the bearings and the affected components as required.


Rear Wheel Bearing Noise

A rough rear wheel bearing produces a noise which continues with the car coasting at low speed and the transmission in neutral. The noise may diminish some when the brakes are gently applied. The noise may also change when performing side-to-side maneuvers with the vehicle.
A rough/noisy rear wheel bearing can be heard by spinning the rear wheels by hand and listening at the hubs for the noise. Inspect and replace the bearings and the affected components as needed.


Knock at Low Speeds

A low speed knock can be caused by a differential case side gear bore that has worn oversize. Inspect the side gears and differential case and replace the components as necessary.


Backlash Clunk

Excessive backlash clunk under acceleration or deacceleration can be caused by any of the following:
Worn differential pinion shaft

Worn differential pinion and/or side gear teeth

Worn thrust washers

Excessive clearance between the side gears and the axle shafts

Excessive clearance between differential side gears and the bore in the case

Excessive drive pinon and ring gear backlash

Inspect, adjust or replace the affected components as necessary.

© 2012 General Motors. All rights reserved.



So yes that would be your issue with rear end knock in my opinion.
 
  #8  
Old 09-11-2012, 05:50 PM
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Just replace the whole diff and call it done. If you have a pull it yourself yard near ya,you can usually get it for less then $100
 
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