Good Vibrations... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

*JCampbell* · 11-19-2008, 02:17 PM

Thursday night I developed a nasty little vibration that is causing me some concern. At about 30-35mph, the dually starts shaking like I'm doing 90mph down a washboard road. It doesn't subside with increasing speed. It will only stop if I slow to under 25mph, or so.

My initial thought was that the harmonic balancer went bad, but when I got home and checked, it was a-okay. So I just parked it until I figure out what's going on. I have a few ideas, but I want to keep them to myself so as not to suggest the problem.

So how 'bout it? Anybody have any ideas on what the culprit may be?

wicked_sky_gazer · 11-19-2008, 02:40 PM

Any loud thumps durring accel or deccel? that could mean a busted motor mount, also might check tire air and balance, tie rod ends, steering linkages, and upper and lower ball joints, look for knotts in any of your tires too.

*JCampbell* · 11-19-2008, 03:20 PM

No, no, no, no, no & no...it's not any of that. The front end was rebuild this summer, so I'm fairly certain it's not in the front suspension.

I'm suspecting a carrier bearing, but I wanted to see if anyone else would mention it.

westie 666 · 11-19-2008, 07:24 PM

I would say carrier bearing or the balance weights have fallen off the drive shaft.

*JCampbell* · 11-19-2008, 07:44 PM

Quote:

Originally Posted by westie 666

...or the balance weights have fallen off the drive shaft.

2nd time I've head that. I'll have to take a look.

**Captkaos** · 11-19-2008, 11:34 PM

Carrier bearing or U-joints since you tow with it or the weights on the shaft. Does it get worse with rpms?

*JCampbell* · 11-20-2008, 12:21 PM

It's not the tow rig, it's my beater:

It's not so much an RMP induced vibration, as much as speed induced. I popped it in nuetral in the driveway and revved it up...no vibration. Couple of guys over on CK5 mentioned U-joints. One guy in particular said he experienced the same symptoms along with a slight whine right before his U-joint at the t-case let go. Coincidentally, I had noticed a quiet squeal at random intervals in the last week or so.

I'm going to jack this pig up and pull the driveline this weekend and see whats up. I'll likely end up "rebuilding" the whole drive line, carrier bearing and all, to just be done with it.

11-19-2008, 02:17 PM	#1
JCampbell Account Suspended Join Date: Apr 2008 Location: Hesperia, Ca Posts: 1,332	Good Vibrations... Thursday night I developed a nasty little vibration that is causing me some concern. At about 30-35mph, the dually starts shaking like I'm doing 90mph down a washboard road. It doesn't subside with increasing speed. It will only stop if I slow to under 25mph, or so. My initial thought was that the harmonic balancer went bad, but when I got home and checked, it was a-okay. So I just parked it until I figure out what's going on. I have a few ideas, but I want to keep them to myself so as not to suggest the problem. So how 'bout it? Anybody have any ideas on what the culprit may be?

11-19-2008, 02:40 PM	#2
wicked_sky_gazer Living Legend Join Date: Oct 2007 Location: owasso oklahoma Posts: 160	Re: Good Vibrations... Any loud thumps durring accel or deccel? that could mean a busted motor mount, also might check tire air and balance, tie rod ends, steering linkages, and upper and lower ball joints, look for knotts in any of your tires too. __________________ '81 c10 sw 355cid roller motor 350turbo with stage two shift kit, poor rear end gearing, not sure peg speed... speedo is mia.. project is temporarily on pause again... Thankyou wonderfull economy.. check it out Im not to worried i have an uncaning ability to save myself from some weeeiiirrd crap East Ok meet East Ok date Tony

11-19-2008, 03:20 PM	#3
JCampbell Account Suspended Join Date: Apr 2008 Location: Hesperia, Ca Posts: 1,332	Re: Good Vibrations... No, no, no, no, no & no...it's not any of that. The front end was rebuild this summer, so I'm fairly certain it's not in the front suspension. I'm suspecting a carrier bearing, but I wanted to see if anyone else would mention it.

11-19-2008, 07:24 PM	#4
westie 666 Registered User Join Date: Mar 2008 Location: AUCKLAND NZ Posts: 264	Re: Good Vibrations... I would say carrier bearing or the balance weights have fallen off the drive shaft. __________________ 77 Cheyenne no longer in bits

11-19-2008, 11:34 PM	#6
Captkaos www.73-87chevytrucks.com Join Date: Dec 1999 Location: Birmingham, AL Posts: 6,935	Re: Good Vibrations... Carrier bearing or U-joints since you tow with it or the weights on the shaft. Does it get worse with rpms? __________________ Chris Lucas 1973 Chevy C-10 1978 GMC Jimmy (2WD) - SOLD 1987 R10 twin turbo LS 1991 R3500 SRW CrewCab 1985 K5 diesel swapped project 1989 K5 2WD conversion w/ Vette susp Project Captkaos Customs 73-87chevytrucks.com

11-20-2008, 12:21 PM	#7
JCampbell Account Suspended Join Date: Apr 2008 Location: Hesperia, Ca Posts: 1,332	Re: Good Vibrations... It's not the tow rig, it's my beater: It's not so much an RMP induced vibration, as much as speed induced. I popped it in nuetral in the driveway and revved it up...no vibration. Couple of guys over on CK5 mentioned U-joints. One guy in particular said he experienced the same symptoms along with a slight whine right before his U-joint at the t-case let go. Coincidentally, I had noticed a quiet squeal at random intervals in the last week or so. I'm going to jack this pig up and pull the driveline this weekend and see whats up. I'll likely end up "rebuilding" the whole drive line, carrier bearing and all, to just be done with it. Last edited by JCampbell; 11-20-2008 at 12:25 PM. Reason: It's my prerogative

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