Vibration - The 1947 - Present Chevrolet & GMC Truck Message Board Network

bios · 12-07-2007, 04:32 PM

I have a vibration in my 79' when I get up to speed on the highway, it's not the wheels or tires. (I just got those replaced.) someone told me it could be my cab or bed mounts, anyone have any ideas before I go and start tearing apart my truck to find out?

**old Rusty C10** · 12-07-2007, 04:35 PM

well the first place id look is the driveshaft either a worn u joint or bad carrier bearing.. if it feels more to one wheel then it would be either out of balance or thewheel bearings is your truck 2 or 4 wd
i have a bad cab bushing and it causes no vibration

bios · 12-07-2007, 04:36 PM

It's a 2wd.

**old Rusty C10** · 12-07-2007, 04:50 PM

yeah if it feels like the center of the truck check the carrier bearing and the u joints for play

bios · 12-07-2007, 04:52 PM

Alright, thank you.

77-383 Step · 12-07-2007, 05:41 PM

If you just got your tires replaced, it could be balanced wrong or might have thrown a weight?

bios · 12-07-2007, 07:18 PM

I've had my weights be off before and it doesn't feel like this.

xtreme80 · 12-07-2007, 09:58 PM

Try swapping front tires and see if the vibration moves with it. You may have a bad tire from the factory. I work as a tire tech and about 1 in every 60 or 70 tires turns out to be a bad one, out of round, etc. More so in truck tires than car tires.

bios · 12-07-2007, 10:00 PM

I've actually alraedy tried that and the problem still persists. Maybe I need to be more clear its not a slight vibration the cab will rattle your fillings out..... well maybe I'm stretching a little bit but you get the idea.

**old Rusty C10** · 12-07-2007, 10:52 PM

just in case you missed it the first time... driveshaft, u joints, or carrier bearing...make sure the mounts on the motor/transmission are good too, although im positive its one of the others i mentioned

bios · 12-08-2007, 12:59 AM

Thank you for being so bold, I was just telling them that my tires have nothing to do with it. I will check everything that you recommended tomorrow. =)

xtreme80 · 12-08-2007, 02:40 AM

hahahaha... that's awesome

Malo83 · 12-08-2007, 03:35 AM

What's everybody yelling about

wolfewerx · 12-08-2007, 05:43 AM

Finally- some type I can read!!!!
Check those driveshafts before one comes loose and hits you over the head!LOL

MylilBowTie · 12-08-2007, 01:55 PM

Pole Vault?

Pyrotechnic · 12-08-2007, 05:05 PM

A worn out or improperly set up rear end will vibrate.

An unbalanced driveshaft or worn out U joints will vibrate.

An engine with balance issues will vibrate.

On my 78 I had a worn out improperly set up rear end and an engine with some weird vibrations. Had the rear end rebuilt and eventually replaced the motor and all was good.

f.monroe · 12-09-2007, 12:20 AM

My cousin had a vibration after an engine swap . Bent fan blade that vibrated like crazy at highway speeds . Frank

12-07-2007, 04:32 PM	#1
bios Registered User Join Date: Mar 2003 Location: oregon Posts: 21	Vibration I have a vibration in my 79' when I get up to speed on the highway, it's not the wheels or tires. (I just got those replaced.) someone told me it could be my cab or bed mounts, anyone have any ideas before I go and start tearing apart my truck to find out? __________________ Was a 72 C20, replaced with a 76 K5 Blazer.....

12-07-2007, 04:35 PM	#2
old Rusty C10 Robert Olson Transport Join Date: Oct 2002 Location: recent transplant to NC USA Posts: 20,313	Re: Vibration well the first place id look is the driveshaft either a worn u joint or bad carrier bearing.. if it feels more to one wheel then it would be either out of balance or thewheel bearings is your truck 2 or 4 wd i have a bad cab bushing and it causes no vibration __________________ Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!!

12-07-2007, 04:36 PM	#3
bios Registered User Join Date: Mar 2003 Location: oregon Posts: 21	Re: Vibration It's a 2wd. __________________ Was a 72 C20, replaced with a 76 K5 Blazer.....

12-07-2007, 04:50 PM	#4
old Rusty C10 Robert Olson Transport Join Date: Oct 2002 Location: recent transplant to NC USA Posts: 20,313	Re: Vibration yeah if it feels like the center of the truck check the carrier bearing and the u joints for play __________________ Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!!

12-07-2007, 04:52 PM	#5
bios Registered User Join Date: Mar 2003 Location: oregon Posts: 21	Re: Vibration Alright, thank you. __________________ Was a 72 C20, replaced with a 76 K5 Blazer.....

12-07-2007, 05:41 PM	#6
77-383 Step Registered User Join Date: Oct 2006 Location: Plano, Texas Posts: 78	Re: Vibration If you just got your tires replaced, it could be balanced wrong or might have thrown a weight?

12-07-2007, 07:18 PM	#7
bios Registered User Join Date: Mar 2003 Location: oregon Posts: 21	Re: Vibration I've had my weights be off before and it doesn't feel like this. __________________ Was a 72 C20, replaced with a 76 K5 Blazer.....

12-07-2007, 09:58 PM	#8
xtreme80 Wishin' I had more money! Join Date: Feb 2007 Location: Eugene, OR Posts: 1,242	Re: Vibration Try swapping front tires and see if the vibration moves with it. You may have a bad tire from the factory. I work as a tire tech and about 1 in every 60 or 70 tires turns out to be a bad one, out of round, etc. More so in truck tires than car tires.

12-07-2007, 10:00 PM	#9
bios Registered User Join Date: Mar 2003 Location: oregon Posts: 21	Re: Vibration I've actually alraedy tried that and the problem still persists. Maybe I need to be more clear its not a slight vibration the cab will rattle your fillings out..... well maybe I'm stretching a little bit but you get the idea. __________________ Was a 72 C20, replaced with a 76 K5 Blazer.....

12-07-2007, 10:52 PM	#10
old Rusty C10 Robert Olson Transport Join Date: Oct 2002 Location: recent transplant to NC USA Posts: 20,313	Re: Vibration just in case you missed it the first time... driveshaft, u joints, or carrier bearing...make sure the mounts on the motor/transmission are good too, although im positive its one of the others i mentioned __________________ Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!!

12-08-2007, 12:59 AM	#11
bios Registered User Join Date: Mar 2003 Location: oregon Posts: 21	Re: Vibration Thank you for being so bold, I was just telling them that my tires have nothing to do with it. I will check everything that you recommended tomorrow. =) __________________ Was a 72 C20, replaced with a 76 K5 Blazer..... Last edited by bios; 12-08-2007 at 12:59 AM.

12-08-2007, 02:40 AM	#12
xtreme80 Wishin' I had more money! Join Date: Feb 2007 Location: Eugene, OR Posts: 1,242	Re: Vibration hahahaha... that's awesome

12-08-2007, 03:35 AM	#13
Malo83 Cruzzzn' Vet Join Date: Jan 2005 Location: Porterville,Ca. Posts: 1,918	Re: Vibration What's everybody yelling about

12-08-2007, 05:43 AM	#14
wolfewerx Registered User Join Date: Dec 2005 Location: waterloo ontario Posts: 19	Re: Vibration Finally- some type I can read!!!! Check those driveshafts before one comes loose and hits you over the head!LOL

12-08-2007, 01:55 PM	#15
MylilBowTie Right turn Clyde Join Date: Nov 2002 Location: Cincinnati, Ohio Posts: 2,911	Re: Vibration Pole Vault? __________________ 1974 C25 LWB: 454 4bbl Carb / TH400 / 3.73 1992 Camaro RS 305 TBI



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12-08-2007, 05:05 PM	#16
Pyrotechnic Registered User Join Date: Feb 2007 Location: Austin, TX Posts: 3,930	Re: Vibration A worn out or improperly set up rear end will vibrate. An unbalanced driveshaft or worn out U joints will vibrate. An engine with balance issues will vibrate. On my 78 I had a worn out improperly set up rear end and an engine with some weird vibrations. Had the rear end rebuilt and eventually replaced the motor and all was good.

12-09-2007, 12:20 AM	#17
f.monroe Senior Member Join Date: May 2004 Location: Caldwell,Tx. Posts: 3,648	Re: Vibration My cousin had a vibration after an engine swap . Bent fan blade that vibrated like crazy at highway speeds . Frank __________________ Born and proudly residing in a Red State !

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