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09-26-2002, 11:08 AM | #1 |
Registered User
Join Date: Jan 2001
Location: Katy, TX...but the love of my life resides in Dublin,OH.
Posts: 1,408
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WTF? my rear end is ringing?
I have an interesting developement in my 68. I heard a periodic bell sound when the truck was not under a load... I didn't have my foot on the gas or on the brake. It sounds like something flopping around and hitting something. to accurately describe it ... it sounds like someone sticking their finger in a fan. I think it does change with rpm I havent caught that yet... it is definately behind me. Well as of this weekend it now does it every time I let my foot off the accelerator, it used to stop when I hit the brake but I still hear it now and it will fade with the brakes applied. Where should I start my investigation? I made sure there wasn't anything obvious like something wrapped around the drive shaft or a broken shock bouncing around... everything looks normal.
Thanks, Perplexed |
09-26-2002, 11:19 AM | #2 |
Gotta Startem Early
Join Date: Oct 2001
Location: Amarillo, TX, USA
Posts: 364
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Man noises are hard to pinpoint, unless the noise leads to breakage. I chased a noise in 99 Sierra for a year and found it to be a piece of tape slapping the hood. I would start with the brakes then go to the rear end and the, god forbid, the tranny. Put the rear up on jack stands, let someone else run it while you listen.
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67 SWB In Progress, one piece at a time, maybe 3 years I will be finished |
09-26-2002, 12:55 PM | #3 |
Jostrans68
Join Date: Mar 2001
Location: Bloomington indiana
Posts: 1,182
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When my 68 made a noise like that it was the carrier bearing coming apart a week later it was toasted.............
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[CGTW Member former 67-72 now with a 96 silverado |
09-26-2002, 12:58 PM | #4 |
Registered User
Join Date: Jan 2001
Location: Katy, TX...but the love of my life resides in Dublin,OH.
Posts: 1,408
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well I don't have a carrier bearing.. one piece driveshaft...
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09-26-2002, 01:04 PM | #5 |
Senior Member
Join Date: Jun 2000
Location: Texan in Iowa
Posts: 2,522
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Check you u-joints. I've had bad u-joints cause a ringing sound when I put it into gear (auto). Ka-chiiiing! I've also driven a newly-bought truck for a couple thousand miles before I realized the rearmost u-joint had no more bearings left, just worn, rusty nubs clanking around in a beat-up cup. Yes, I am a lucky man. I had dismissed it as slack in the rear end. Good luck!
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Ben '68 Chevy C10 Custom LWB 327/TH400 2nd owner '16 GMC Sierra 1500 SLE Dblcab 4wd 5.3 |
09-26-2002, 02:56 PM | #6 |
Senior Member
Join Date: Dec 2001
Location: Redding,CA...USA
Posts: 4,736
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if its something in the rear end...dont worry it will find its way out..mine did, a nice dime size hole in the diff. cover. funny thing though, after careful inspection, I couldn't find anything wrong. Now no more noise or clunks or vibration
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It's called "drag racing" if they called it "tic..tic..WHAM!..BANG! F*&K!!!", they'd have to keep the magazines under the counter with the other men's publications click the clicky to join the site.... http://67-72chevytrucks.com/vboard/payments.php 67 lwb..first hotrod in 25 years..540 best ET is 9.45 @ 141.44 Anderson,CA |
09-26-2002, 03:30 PM | #7 |
Almost Satisfied
Join Date: Mar 2002
Location: Springfield, MO
Posts: 2,932
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Did you sit on your cell phone.....hehehehe I couldn't resist!
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1971 C10 Stepside. LSx 6.0 with BTR Stage IV, Speed Engineering Headers, 4L80e transmission w/3200 Circle-D Stall. 3.73. Posi. Purchased this truck when I was 17. I started the rebuild (or take apart) in 1993. I have drug it around all over the country in pieces. Finally back on the road in 2021. "I can't complain, but sometimes I still do. Life's been good to me so far." |
09-26-2002, 03:39 PM | #8 |
computer illiterate
Join Date: Jan 2001
Location: Des Moines, IA
Posts: 6,446
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check your pinion nut
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72 2wd blazer 72 swb 4x4 |
09-26-2002, 04:03 PM | #9 |
Registered User
Join Date: Jan 2001
Location: Katy, TX...but the love of my life resides in Dublin,OH.
Posts: 1,408
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I get it... ha ha rearend ringing....I will pull the cover and snoop around.:p
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09-26-2002, 10:11 PM | #10 |
Registered User
Join Date: Apr 2000
Location: Chester County PA, USA
Posts: 1,228
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My ring gear bolts came loose one time and made a ringing noise, a clunking noise, and finally a loud bang noise. I looked under my truck and my diff cover had a hole in it the size of a ring gear bolt and oil was running out. I gooped the hole with RTV , filled it back up and drove it home.
I also had the pinion nut come loose on another truck. You gotta use red locktight on them. And another time a pinion bearing went bad and was ringing on my blazer. It only made noise between 45 and 55 MPH. Randy
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72 k/10 short wideside 72 k/5 Blazer 72 K/5 Blazer - obstacle course racer 72 custom/10 8' bed 70 K/5 Blazer 67 C-30 GMC Flat bed 86 GMC K2500 Plow Truck 85 GMC K3500 84 M1008 85 M1008 77 G30 Motor Home 72 Sears 12hp Tractor Glenmoore, Pennsylvania |
09-27-2002, 04:51 PM | #11 |
Registered User
Join Date: Nov 2000
Location: chimayo, nm, usa
Posts: 898
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Dirt Dobber
Dirt Dobber, Keep me posted on what you find, my truck has developed a similar noise. To me it's more of a whine or continiuous ring, than fingers in a fan. Keep me posted. Much appreciated...
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09-27-2002, 04:59 PM | #12 |
Registered User
Join Date: Jul 2002
Location: California central coast
Posts: 126
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A whine is a different problem.
A speed dependent high pitch whine suggests a failing pinion bearing, though there are other things it could be. BTW, if the "finger-in-the-fan" noise changes with RPM and not speed, it can't possibly be in the rear end at all. It has to be in the engine or transmission, or be related to a belt-driven accessory. |
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