Thumping noise from rear - The 1947 - Present Chevrolet & GMC Truck Message Board Network

oldblu72 · 12-10-2016, 04:07 PM

I recently began noticing a thumping noise coming from the rear end of my 72 C10. It's only noticeable as I slowly pull into the driveway. The rear drums look fine but as I turn the wheel there is a slight squeak and then a thump sound like metal on metal. Would send a video if could figure out how to load it on here. I'm a newbie and will appreciate any information.

Wrenchbender Ret · 12-10-2016, 05:32 PM

It might be the driveshaft carrier brg or a u-joint. If you checked the drums then I'm sure the wheel lug nuts are tight.

oldblu72 · 12-10-2016, 06:01 PM

Thanks for your reply. I removed the drum and turned the wheel by twisting the wheel studs. It clunks as I rotate the wheel, twice per full rotation, in the same places as the wheel rotates.

ElKotze · 12-12-2016, 01:04 AM

I would check the u-joints first.

LongBox · 12-12-2016, 11:33 AM

If it happens when you are doing slow speed turns, or turning one rear wheel only, it may be an issue with the differential in your rear end. Does your truck have positraction? If so, it may be the posi unit.

Wrenchbender Ret · 12-12-2016, 11:35 AM

You may wan't to take u-joint loose from the pinion yoke. You can check the u-joints good that way & then if you still get that clunk you need to take the cover off the rear end & check for broken teeth.

12-10-2016, 04:07 PM	#1
oldblu72 Registered User Join Date: Oct 2012 Location: Woodbury TN Posts: 2	Thumping noise from rear I recently began noticing a thumping noise coming from the rear end of my 72 C10. It's only noticeable as I slowly pull into the driveway. The rear drums look fine but as I turn the wheel there is a slight squeak and then a thump sound like metal on metal. Would send a video if could figure out how to load it on here. I'm a newbie and will appreciate any information.

12-10-2016, 05:32 PM	#2
Wrenchbender Ret Registered User Join Date: Oct 2005 Location: Overland Park, Ks. Posts: 5,229	Re: Thumping noise from rear It might be the driveshaft carrier brg or a u-joint. If you checked the drums then I'm sure the wheel lug nuts are tight.

12-10-2016, 06:01 PM	#3
oldblu72 Registered User Join Date: Oct 2012 Location: Woodbury TN Posts: 2	Re: Thumping noise from rear Thanks for your reply. I removed the drum and turned the wheel by twisting the wheel studs. It clunks as I rotate the wheel, twice per full rotation, in the same places as the wheel rotates.

12-12-2016, 01:04 AM	#4
ElKotze Registered User Join Date: Nov 2014 Location: Southwest Kansas Posts: 306	Re: Thumping noise from rear I would check the u-joints first. __________________ '64 C10 LWB, 283, 5speed '68 C20 LWB, 327, 4speed '69 C20 Custom Camper Longhorn, 350, 4speed '72 C20 Cheyenne Super, 396, TH400 '66 C60, 292, 4speed

12-12-2016, 11:33 AM	#5
LongBox Registered User Join Date: Sep 2016 Location: Vancouver BC Posts: 784	Re: Thumping noise from rear If it happens when you are doing slow speed turns, or turning one rear wheel only, it may be an issue with the differential in your rear end. Does your truck have positraction? If so, it may be the posi unit. __________________ Rick -69 GMC 910 Long Box, 350 -98 Chev Silverado 1500, 350 Vortec 4L60e -08 Mustang GT Convertible

12-12-2016, 11:35 AM	#6
Wrenchbender Ret Registered User Join Date: Oct 2005 Location: Overland Park, Ks. Posts: 5,229	Re: Thumping noise from rear You may wan't to take u-joint loose from the pinion yoke. You can check the u-joints good that way & then if you still get that clunk you need to take the cover off the rear end & check for broken teeth.



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