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#1 |
Registered User
Join Date: Nov 2017
Location: Dora Alabama
Posts: 2
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Roaring
Hello I've been away from the forum for awhile,I suffered a head injury and I'm just getting back to my C10 addiction.(I tried a patch but it was mopar)
The other day I noticed a hint of a vibration and quiet roar,I assumed it was hanger bearing and greased it but wasnt it. So yesterday I drove the truck to try and figure it out but it stopped roaring and went straight to grinding,luckily I was just a block away. I frared the worst when I pulled the inspection plate the image is what I saw,I re tightened the pinion nut & the noise is gone. I don't know much about rear diffs should I replace the crush seal? Or Will that even help? Truck is a 1972 C10 Highlander edition, and the ration is (I'm guessing) is close to a 3:73. I've had probably a hundred car/trucks never seen this before. I would appreciate any info. Thanks guyshttps://photos.app.goo.gl/n4LziVmh5qAySfGY8 BTW ive had the truck since 2015 and I think it has happened b4 cause the grooves look deeper than if it had just happened. |
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#2 |
Senior Member
![]() Join Date: Jan 2001
Location: Orem, Utah
Posts: 7,905
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Re: Roaring
First of all, welcome back.
Can you post a picture of what you're talking about? Was the noise primarily under acceleration, under deceleration, or at a steady speed?
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I have sworn upon the altar of God, eternal hostility against every form of tyranny over the mind of man. - Thomas Jefferson |
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#3 |
Senior Member
![]() Join Date: Dec 1999
Location: TX
Posts: 1,569
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Re: Roaring
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#4 |
Senior Member
![]() Join Date: Dec 1999
Location: TX
Posts: 1,569
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Re: Roaring
Looks like the pinion nut came loose allowing the pinion gear to rub on the carrier inside the rear end. Maybe someone knowledgeable about rear ends can comment on what repairs might be needed after something like this happens. OP stated they tightened the pinion nut and the noise went away. But what are the long term problems?
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#5 |
Moderator
![]() Join Date: Jun 2017
Location: Cherryville, NC
Posts: 2,193
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Re: Roaring
That looks nasty....
I would be concerned about metal dust contamination throughout the entire rear axle unit.... IMO....the rear end needs to come out and be fully rebuilt with new bearings, crush sleeves and seals....as a safety mechanism, I always use Red Loctite on a NEW pinion nut after I get the preload values correct.... You may be able to just get away with a new nut and loctite, but it really needs to come out and be done correctly.... ![]() ![]() ![]()
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#6 | |
Who Changed This?
![]() Join Date: Jan 2013
Location: Simi Valley, CA
Posts: 10,392
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Re: Roaring
Quote:
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~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA |
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#7 |
Senior Member
![]() Join Date: Jan 2001
Location: Orem, Utah
Posts: 7,905
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Re: Roaring
The pinion bearing definitely needs to be replaced at a minimum. You're driving a grenade with the pin pulled...
__________________
I have sworn upon the altar of God, eternal hostility against every form of tyranny over the mind of man. - Thomas Jefferson |
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#8 |
Senior Member
![]() Join Date: Nov 2019
Location: Cocoa FL
Posts: 596
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Re: Roaring
What everyone said, it's eating itself. Rebuilding it from the ground up is what is needed.
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Die with memories, not dreams. Not to brag, but I don't need alcohol to make really bad decisions. 1969 GMC Short Step Side |
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#9 |
Account Suspended
![]() Join Date: Jul 2016
Location: Tacoma, WA
Posts: 6,873
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Re: Roaring
I have tightened up dozens of loose pinion nuts and then drove them. Its not the best fix but should be fine depending on bearing condition etc.
drive it and see what happens, the bearings are more durable than you think. Now if your hauling heavy loads or have to have it 100% then rebuild the rear end. If the bearings are bad it would make noise even with the tightened up pinion nut. |
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