Blew out my rear end on the way home tonight, I think. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

dion · 10-24-2002, 09:07 PM

I was on the Freeway and all of a sudden bang! And then klunk klunk all the way home. It would change gears so I don't think it's the tranny, I put it in all gears and it drove, when I put it in L1 it was really bad. I was able to go slow and it didn't make much noise and when I sped up it got a little louder. I would pull over and the noise would stop but then start up again. I don't think it's the U Joints. What do you guys think?

Longhorn Man · 10-24-2002, 10:57 PM

U-joint or carrier bearing.
If it was your diff, you would get a whining noise...untill it stopped. Then you'd be walking.

Hooter · 10-24-2002, 11:07 PM

70% sure that it is your carrier bearing somewhat same thing happened on my 74 chevy, it was weird squealing noise then one day a bad vibration

dion · 10-24-2002, 11:27 PM

That's what I was hoping, how would I know if it was the tranny?

Tyler_69C10 · 10-24-2002, 11:30 PM

If it was the tranny you most likely wouldn't have all gears. I suggest sniffing the tranny fluid, if it smells a little burned, then you may have baked it.

But I think these other guys are probably right.

**COBALT** · 10-25-2002, 01:10 AM

Yeah, here's my thoughts:

1. If it was your differential you wouldn't have made it home. Any sudden BANG noise will likely result in frozen axles - frozen truck. At least you'd have a vibration that shook the whole truck. It would vibrate your teeth out, and screech to no end.

2. If it was the transmission you'd have possibly the same result. The few times I've had an automatic transmission go belly-up it stuck in one gear, and P or N was out of the question. Also, the pressure built up so fast it busted the main seal, and I had a river of tranny fluid. The smell went with it.

IF you just had a lot of noise you either popped a U-joint loose, or your carrier bearing is broke. I've even heard of rocks bouncing off the road and getting jammed next to the driveshaft.

Just get under and look!

71GMC_3/4T · 10-25-2002, 10:48 AM

I had this happen last year on my 92 Z-71.
It started with shuddering during moderate acceleration, so I knew something was wrong. Then it started to click. I thought it was the T-case, so I put the rear end up on jack stands and idled it in the driveway (pointed toward the street, not my garage, of course) and found that all the noise was coming from the rearend. I found a guy who would look at it (was cold and didn't want to do it myself) in a couple of days. I kept driving it.
One day when I was heading back to work, it went "BANG" and got quiet again. RuhRoh. Then the clicking and shuddering started again. I was able to drive it 40 miles to Denver and get it fixed. The ring and pinion were shot. The pinion had two teeth that were cracked but still in place. The ring was missing one tooth and several others were not too good either. He said the carrier had probably shifted over and allowed the gears to mismatch. It ended up costing me several dollars, but it was still cheaper than any used rear end I could find - go figure... Everything except the axle shafts and the housing is new now, so I hope it will last another 150,000 miles.
I hope it's just your U-joints!

Longhorn Man · 10-25-2002, 11:40 AM

Wow...never heard of that hapening before...and OUCH!

dion · 10-25-2002, 02:21 PM

I'm pulling the drive shaft out now, the carrier bearing is shot, I knew that much, it has been for a while now. The middle set of U Joints are bad.

71GMC_3/4T · 10-25-2002, 03:32 PM

Oh, what a relief I'll bet that is!
Glad to hear that's all it was.

JoetheMobster · 10-25-2002, 04:49 PM

Yep, my guess would be the carrier bearing too! I had this happen to me not too long ago. My carrier bearing had seized, ripping the rubber support all to hell. Eventually the rubber tore up enough, and the metal surroud cracked, dropping the driveshaft out. My driveshaft was swinging around like a person with a hula-hoop!!!

10-24-2002, 09:07 PM	#1
dion 72 Cheyenne Join Date: Oct 2001 Location: San Diego Posts: 2,086	Blew out my rear end on the way home tonight, I think. I was on the Freeway and all of a sudden bang! And then klunk klunk all the way home. It would change gears so I don't think it's the tranny, I put it in all gears and it drove, when I put it in L1 it was really bad. I was able to go slow and it didn't make much noise and when I sped up it got a little louder. I would pull over and the noise would stop but then start up again. I don't think it's the U Joints. What do you guys think? __________________ Burnout Idle 1972Cheyenne 1966/67Stouts

10-24-2002, 11:07 PM	#3
Hooter My other Love Join Date: Aug 2001 Location: Castlegar B.C. Canada Posts: 4,085	70% sure that it is your carrier bearing somewhat same thing happened on my 74 chevy, it was weird squealing noise then one day a bad vibration __________________ Castlegar B.C.The great white North (Canada Eh!) Hooter_5@hotmail.com First generation Monte Carlo club pictures of my life

10-24-2002, 11:27 PM	#4
dion 72 Cheyenne Join Date: Oct 2001 Location: San Diego Posts: 2,086	That's what I was hoping, how would I know if it was the tranny? __________________ Burnout Idle 1972Cheyenne 1966/67Stouts

10-24-2002, 11:30 PM	#5
Tyler_69C10 Registered User Join Date: May 2002 Location: Sidney, BC, Canada Posts: 63	If it was the tranny you most likely wouldn't have all gears. I suggest sniffing the tranny fluid, if it smells a little burned, then you may have baked it. But I think these other guys are probably right. __________________ 1969 Chevy C/10 LWB A great work truck!

10-25-2002, 01:10 AM	#6
COBALT Senior Member Join Date: Sep 2001 Location: Seattle, WA, USA Posts: 5,817	Yeah, here's my thoughts: 1. If it was your differential you wouldn't have made it home. Any sudden BANG noise will likely result in frozen axles - frozen truck. At least you'd have a vibration that shook the whole truck. It would vibrate your teeth out, and screech to no end. 2. If it was the transmission you'd have possibly the same result. The few times I've had an automatic transmission go belly-up it stuck in one gear, and P or N was out of the question. Also, the pressure built up so fast it busted the main seal, and I had a river of tranny fluid. The smell went with it. IF you just had a lot of noise you either popped a U-joint loose, or your carrier bearing is broke. I've even heard of rocks bouncing off the road and getting jammed next to the driveshaft. Just get under and look! __________________ '69 3/4 ton C20 2wd-350ci/TH400 '69 3/4 ton Custom 20 2wd-350ci/4sp Manual '99 2wd 5.7 Chevy Tahoe Seattle, WA.

10-24-2002, 10:57 PM	#2
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	U-joint or carrier bearing. If it was your diff, you would get a whining noise...untill it stopped. Then you'd be walking.

10-25-2002, 10:48 AM	#7
71GMC_3/4T Weapons Of Construction Join Date: Apr 2000 Location: Colorado, USA Posts: 1,095	I had this happen last year on my 92 Z-71. It started with shuddering during moderate acceleration, so I knew something was wrong. Then it started to click. I thought it was the T-case, so I put the rear end up on jack stands and idled it in the driveway (pointed toward the street, not my garage, of course) and found that all the noise was coming from the rearend. I found a guy who would look at it (was cold and didn't want to do it myself) in a couple of days. I kept driving it. One day when I was heading back to work, it went "BANG" and got quiet again. RuhRoh. Then the clicking and shuddering started again. I was able to drive it 40 miles to Denver and get it fixed. The ring and pinion were shot. The pinion had two teeth that were cracked but still in place. The ring was missing one tooth and several others were not too good either. He said the carrier had probably shifted over and allowed the gears to mismatch. It ended up costing me several dollars, but it was still cheaper than any used rear end I could find - go figure... Everything except the axle shafts and the housing is new now, so I hope it will last another 150,000 miles. I hope it's just your U-joints! __________________ 1971 GMC 2500, 402/TH400 4.10 Daily Driver Lafayette, CO

10-25-2002, 11:40 AM	#8
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Wow...never heard of that hapening before...and OUCH!

10-25-2002, 02:21 PM	#9
dion 72 Cheyenne Join Date: Oct 2001 Location: San Diego Posts: 2,086	I'm pulling the drive shaft out now, the carrier bearing is shot, I knew that much, it has been for a while now. The middle set of U Joints are bad. __________________ Burnout Idle 1972Cheyenne 1966/67Stouts

10-25-2002, 03:32 PM	#10
71GMC_3/4T Weapons Of Construction Join Date: Apr 2000 Location: Colorado, USA Posts: 1,095	Oh, what a relief I'll bet that is! Glad to hear that's all it was. __________________ 1971 GMC 2500, 402/TH400 4.10 Daily Driver Lafayette, CO

10-25-2002, 04:49 PM	#11
JoetheMobster Listening since '86 Join Date: Sep 2001 Location: Canada Posts: 1,799	Yep, my guess would be the carrier bearing too! I had this happen to me not too long ago. My carrier bearing had seized, ripping the rubber support all to hell. Eventually the rubber tore up enough, and the metal surroud cracked, dropping the driveshaft out. My driveshaft was swinging around like a person with a hula-hoop!!! __________________ 2007 Saturn Aura - hey it WAS a GM product



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