Rear End Knocking Noise
#1
Beginning Member
Thread Starter
Join Date: Aug 2011
Location: Iowa
Posts: 38

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??
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.
#3
Beginning Member
Thread Starter
Join Date: Aug 2011
Location: Iowa
Posts: 38

1998 GMC Jimmy
i'm really needing some help guys. I need to fix it like asap
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.
#5
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Join Date: Aug 2011
Location: Iowa
Posts: 38

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
#7
Rear Drive Axle Noises
Gear Noise
Gear noise or whine is audible from 32–89 km/h (20–55 mph) under 4 driving conditions:
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:
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.
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.
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