Strange noises coming from rear-end - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Codypaul · 06-20-2010, 08:42 PM

now all joking aside i hear strange noises while driving my '70 gmc. First noise is when i get on it or off the throttle. it clunks. now im pretty sure its the u joints and im not all to worried about it.

the second noise is more of a chatter. almost like a hollow pipe slapping against something. i only get this noise when down shifting or coasting down a hill.

My dad is a tech and owns his own shop. Rather than asking him i wanna figure it out my self

Gotta make him proud.

any help would be great thanks!

**truckdude239** · 06-20-2010, 09:00 PM

carrier bearing

Codypaul · 06-20-2010, 09:11 PM

Quote:

Originally Posted by truckdude239

carrier bearing

whats that?

would that be the cause of noise number 2?

tommys69/454 · 06-20-2010, 09:21 PM

on the drive shaft

Codypaul · 06-20-2010, 09:25 PM

Quote:

Originally Posted by tommys69/454

on the drive shaft

is it inside of the rear end

**Stocker** · 06-20-2010, 10:52 PM

Carrier bearing is a support bearing midway (lengthwise) on a two-piece driveshaft.

But it could easily be bad u-joints.

Codypaul · 06-20-2010, 11:42 PM

Quote:

Originally Posted by Stocker

Carrier bearing is a support bearing midway (lengthwise) on a two-piece driveshaft.

But it could easily be bad u-joints.

after doing a little research and looking a little closer, i think its a combination of both.
Thanks guys your awesome

67ChevyRedneck · 06-20-2010, 11:48 PM

Quote:

Originally Posted by Codypaul

My dad is a tech and owns his own shop. Rather than asking him i wanna figure it out my self

Gotta make him proud.

Isn't asking us cheating then?

Grab your driveshaft and try to rotate it and move it back in forth. Any play at all and it's time for new U-joints.

Also check for a bad carrier bearing as suggested.

While your back there, check the rear for leaks and check the fluid level. Might be a good idea to change it too, it could have been a looooooong time since it was done last.

Kayotic · 06-21-2010, 12:53 AM

Climb underneath, Grab your shaft and yank it...

Seriously, give it a good tug and check for excessive movement...

Codypaul · 06-21-2010, 12:58 AM

Quote:

Originally Posted by Kayotic

Climb underneath, Grab your shaft and yank it...

Seriously, give it a good tug and check for excessive movement...

i did that and i did the whole spin it thing to see if the u joints moved. it was kinda sloppy didnt seem to bad though.

Kayotic · 06-21-2010, 01:01 AM

The first clunk, could it maybe be a worn trans mount.

My '86 (automatic) did that and I know for sure the mount was bad.

ZKinZ · 06-21-2010, 02:00 AM

Quote:

Originally Posted by Codypaul

now all joking aside i hear strange noises while driving my '70 gmc. First noise is when i get on it or off the throttle. it clunks. now im pretty sure its the u joints and im not all to worried about it.

the second noise is more of a chatter. almost like a hollow pipe slapping against something. i only get this noise when down shifting or coasting down a hill.

My dad is a tech and owns his own shop. Rather than asking him i wanna figure it out my self

Gotta make him proud.

any help would be great thanks!

Does it also clunk when hitting bumps?
Mine developed a similar noise just today and I'm currently trying to diagnose it as well.
It sounds like it's directly under where the cab and bed meet.

cdowns · 06-21-2010, 08:02 AM

while you have the chance(its not forever) take full advantage of your fathers expertise if not you will regret it later in life

junkyardjohn · 06-21-2010, 12:36 PM

Quote:

Originally Posted by cdowns

while you have the chance(its not forever) take full advantage of your fathers expertise if not you will regret it later in life

PRETTY GOOD ADVICE. THIS IS COMMING FROM AN OLD FART WHO HAS 3 GROWN BOYS (WELL NOW THERE ALL MEN WITH KIDS OF THERE OWN). I WAS ALWAYS PROUD THAT THEY COULD DIAGNOSE PROBLEMS ON THIER OWN, BUT ESPECIALLY PROUD WHEN THEY WOULD ASK THIER OLD MAN FOR A LITTLE ADVICE OR HELP. SHOOT SOMETIMES THEY STILL DO. (BUT I THINK IT'S FOR MY BENIFIT)

JOHN

swierker · 06-21-2010, 03:48 PM

Quote:

Originally Posted by Kayotic

Climb underneath, Grab your shaft and yank it...

Shaky · 06-21-2010, 04:05 PM

My buddy had a '70 that clunked bad when going from forward to reverse and vice versa. Turned out the the big U-bolts that hold the rear to the control arms had rusted. They looked fine where they went over the tubes, but down in the pockets they rusted down to nothing.

He discovered it when one broke on I-95 in heavy traffic and he did a 360.

Kayotic · 06-21-2010, 04:34 PM

Shaky makes a good point.

I have seen that too. The u-bolt worn to nothing inside the pockets.

Worth a look also while your under there.

Codypaul · 06-25-2010, 11:35 PM

i have no carrier bearing. Is it because my truck is lifted?

06-20-2010, 08:42 PM	#1
Codypaul Registered User Join Date: Apr 2010 Location: Duluth MN Posts: 64	Strange noises coming from rear-end now all joking aside i hear strange noises while driving my '70 gmc. First noise is when i get on it or off the throttle. it clunks. now im pretty sure its the u joints and im not all to worried about it. the second noise is more of a chatter. almost like a hollow pipe slapping against something. i only get this noise when down shifting or coasting down a hill. My dad is a tech and owns his own shop. Rather than asking him i wanna figure it out my self Gotta make him proud. any help would be great thanks!

06-20-2010, 09:00 PM	#2
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,238	Re: Strange noises coming from rear-end carrier bearing __________________ David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube

06-20-2010, 09:21 PM	#4
tommys69/454 1969 short box Join Date: Sep 2007 Location: waterloo,newyork Posts: 146	Re: Strange noises coming from rear-end on the drive shaft __________________ tommy morehouse

06-20-2010, 10:52 PM	#6
Stocker 20' Daredevil (Ret) Join Date: May 2003 Location: Jefferson State Posts: 13,727	Re: Strange noises coming from rear-end Carrier bearing is a support bearing midway (lengthwise) on a two-piece driveshaft. But it could easily be bad u-joints. __________________ - Mike - 1972 K20 LWB 350/350/205 RIP El Jay Last edited by Stocker; 06-20-2010 at 10:53 PM.

06-21-2010, 12:53 AM	#9
Kayotic Registered User Join Date: Mar 2008 Location: Lawrenceville, Ga Posts: 300	Re: Strange noises coming from rear-end Climb underneath, Grab your shaft and yank it... Seriously, give it a good tug and check for excessive movement... __________________ Atlanta Craigslist Hurst Indy Pickup Truck 3-Speed Shifter - 5010016

06-21-2010, 01:01 AM	#11
Kayotic Registered User Join Date: Mar 2008 Location: Lawrenceville, Ga Posts: 300	Re: Strange noises coming from rear-end The first clunk, could it maybe be a worn trans mount. My '86 (automatic) did that and I know for sure the mount was bad. __________________ Atlanta Craigslist Hurst Indy Pickup Truck 3-Speed Shifter - 5010016 Last edited by Kayotic; 06-21-2010 at 01:02 AM.

06-21-2010, 08:02 AM	#13
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: Strange noises coming from rear-end while you have the chance(its not forever) take full advantage of your fathers expertise if not you will regret it later in life __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

06-21-2010, 04:05 PM	#16
Shaky Six in a row makes it go... Join Date: Mar 2009 Location: Vacationland: Maine Posts: 1,346	Re: Strange noises coming from rear-end My buddy had a '70 that clunked bad when going from forward to reverse and vice versa. Turned out the the big U-bolts that hold the rear to the control arms had rusted. They looked fine where they went over the tubes, but down in the pockets they rusted down to nothing. He discovered it when one broke on I-95 in heavy traffic and he did a 360. __________________ 67 C20 long step resto: http://67-72chevytrucks.com/vboard/s...d.php?t=342086 66 C10 long step build: http://67-72chevytrucks.com/vboard/s...=1#post3814790 CT to Alaska in a 67 C10: http://67-72chevytrucks.com/vboard/s...d.php?t=399224 “The height of sophistication is simplicity." - Clare Boothe Luce

06-21-2010, 04:34 PM	#17
Kayotic Registered User Join Date: Mar 2008 Location: Lawrenceville, Ga Posts: 300	Re: Strange noises coming from rear-end Shaky makes a good point. I have seen that too. The u-bolt worn to nothing inside the pockets. Worth a look also while your under there. __________________ Atlanta Craigslist Hurst Indy Pickup Truck 3-Speed Shifter - 5010016

06-25-2010, 11:35 PM	#18
Codypaul Registered User Join Date: Apr 2010 Location: Duluth MN Posts: 64	Re: Strange noises coming from rear-end i have no carrier bearing. Is it because my truck is lifted? __________________ 1970 GMC K1500 1993 Chevy K2500



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