Need Help with vibration. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Premium72 · 08-16-2006, 09:44 AM

okay. so around 35 i get this pulsing fibration from the truck. its an all over kinda thing so i dont think its a tire /balancing issue(ive already rotated them with no change n the vibration). i pulled the drive shaft and replaced the center u joint(the rear is new an the front seemed to be in good shape.) the hanger baring isnt all that old and also seems to be in good shape. checkd the dope in the diff, and topped it off just for the heck of it.
also when driving, when the vibration starts and i pop it in to neutral, it stops. but. if i rev the engine to a certian rpms(dont know what no tach installed) the vibration will continue. im not sure if this is in the drvie line(driveshaft to rearend) or in the engine or tranny. i checked all fluids and made sure everything was tight(engine, tranny, drive sahft rear end.) so im at a stant still now. ANY IDEAS??.. thanx. w.

cdowns · 08-16-2006, 10:08 AM

check your motor and tranny mounts

Premium72 · 08-16-2006, 02:08 PM

check as is replace? i put a wrench on em and gave a hell of a tug. not loose..think i may need new ones? would any thing internally cuase this? any help is greatly appreciated. thanx. w.

70rs/ss · 08-16-2006, 02:22 PM

What type of tranny do you have? This could be a motor or tranny thing if it vibrates in nuetral. Did it just start? More info will help us help you.

larry may · 08-16-2006, 02:44 PM

Found my problem with the fly wheel and clutch disc. Replace both problem went away

Premium72 · 08-16-2006, 04:32 PM

its a turbo 350, the problem stops when i bump it in neutral and just coast. but when i rev the motor it vibrates. ill look into the fly wheel issue. thanx. w.

Solver · 08-16-2006, 04:54 PM

Had that problem just as you described and for me it was my torque converter was bad.

crazy longhorn · 08-16-2006, 05:27 PM

Quote:

Originally Posted by Solver

Had that problem just as you described and for me it was my torque converter was bad.

I have had that problem......also, you might unbolt the converter , & turn it on the flex plate to find the best "balance point". You have 3 spots to bolt it down......just a thought before you spend the cash

Best of luck...

L

70rs/ss · 08-16-2006, 06:06 PM

could be loose bolts on the flywheel, check that first.

Premium72 · 08-16-2006, 06:08 PM

cool.. ill look into it later this week.. was playn with it some more today. with the truck i park and given it gas and holdin it at a certian rpm(got no tach not sure what) it just shakes the hell outa the truck.ythis makes me think its sumthn with the motor-tranny or some where in b-tween. .ill play with the torque converter tomorrow or so..thanx fellas you never let me down!!..ROCK ON!!

Premium72 · 08-16-2006, 10:36 PM

OK. well i put a wrench on all the bolts to the fly wheel none loose, and gave em all a good tug for the hell of it. put a wrench on every bolt under neath,(engine mounts, tranny mounts, front crossmember, flywheel.) nuthn even lose. im starting to think it maybe my balancer. any thoughts on this? let me know. i may pull this bad boy apart in the next few days and install a new balancer. thanx. w.

Solver · 08-16-2006, 11:24 PM

Do you mean the balancer on the front of the engine?
Doesn't really explain why vibration goes away when in neutral then

Premium72 · 08-17-2006, 12:11 AM

how doesnt it. when im driving the truck, the vibration starts....ill pop in into neutral, let it coast no vibration. the motor has idled down and not in the same rpm range. it will also do this in park. rev the engine and holding it at the rpm's that vibrate the truck. im going to check more into it in the am. (not tryning to be a smart ass. this is just getting a bit frustrating.....just trying to think clearly and not smash sumthn with a wrench..hahaha. thanx as always. w. )

70rs/ss · 08-17-2006, 12:01 PM

Balancer could be it, it makes the vibration at a certain rpm in gear or in nuetral or park, so it is engine rotating assembly related anything that spins with the crankshaft could be it, if not balancer, I'd really lean to thinking its the converter. It is pain in the ass, but you could pull the tranny and put a new stocker in there (pull the pan and look for metal, as converters usually frag when the do this), if there is metal, then have the tranny gone through. As long as the balancer is there it sould be ok, by the way have you pulled the plugs and run compression? This could be a high speed miss? I do not know if any of these are it, but any of them could be, hope something helps.

jhow66 · 08-17-2006, 01:35 PM

Bent fan blade--remove belt and try it.

Premium72 · 08-17-2006, 04:19 PM

Quote:

Originally Posted by jhow66

Bent fan blade--remove belt and try it.

huh? you bull$hitn me or serious

my step dad also recomended a compression test.. he doesnt think it would be the converter. i do have a filter an gasket layn around for the tranny may do that some time this week, just to check inside there....but the fan thing? come on?

OhioDan · 08-17-2006, 04:31 PM

Quote:

Originally Posted by jhow66

Bent fan blade--remove belt and try it.

You asked. If it spins with the motor, it could be suspect. Don't underestimate anything. Had an engine (4 cyl) at work that broke an alt. bolt. Vibrated like crazy. R&R'd bolt, no vibration. Can't hurt to check can it? Hope ya find the problem before a big outlay of cash.

Later,

Dan

70rs/ss · 08-17-2006, 04:31 PM

It could be? It will take like 5 min, unbolt it and run two bolts back in the pulley without the fan and run it to the rpm where the vibration usually is and see. I have a wicked vibration in my old truck, but I was running solid motor mounts, so it was to be expected. Did it just start all the sudden?

Premium72 · 08-17-2006, 04:53 PM

the vibration has been there somewhat from the start of the buildup....but i would find things here and there that i overlooked and it would get better as i wrenched an tightend all my loose ends.
took off the belt to the fan, still vibrates. still think it maybe the balancer, the ruber all around is pretty smooth but for one spot looks pretty ruff. it may have spun...what do you guys think? how do tell if a balancer has gone bad? thanx for all the help.

jhow66 · 08-17-2006, 05:06 PM

See that didn't take long to check did it?
1--tells us what motor you have and what you did in it's buildup.
2--tells us if you started with a complete motor (did it come with the balancer and flexplate?)

*rage'nrat638* · 08-17-2006, 06:37 PM

well i got the same problem with my 69 now..i just got my flex plate and all new bolts from summit..85.00
i am waiting for my brand new converter and front seal from them now 80.00..
i am not pulling any thing apart and skipping a 80.00 part to have to do it all over again..

Premium72 · 08-17-2006, 09:15 PM

350. mild comp cam.(280 lift i b-leave), engine was in the truck when tore apart.was just stripped cleaned and a few new gaskets put in. hei dist. turbo 350 trany, thats about it. i looked at another balancer today in another truck. made me think even more its the balancer. the ruber in mine is f-ed up on one spot and looke like its coming out in another. ordered one today will be in in the morn. thanx again for the help...i think ill just put in a 502...hehehe..thanx. again. w.

jhow66 · 08-18-2006, 11:22 AM

Quote:

Originally Posted by Premium72

350. mild comp cam.(280 lift i b-leave), engine was in the truck when tore apart.was just stripped cleaned and a few new gaskets put in. hei dist. turbo 350 trany, thats about it. i looked at another balancer today in another truck. made me think even more its the balancer. the ruber in mine is f-ed up on one spot and looke like its coming out in another. ordered one today will be in in the morn. thanx again for the help...i think ill just put in a 502...hehehe..thanx. again. w.

If you want a demo ride in one with a 502 come on up and take mine for a spin(P.S.-the wider the grin the more I charge for the demo

)

Premium72 · 08-18-2006, 02:35 PM

ha...we'll see about that. you any where near deals gap? im going to plan a trip up there later in sept maybe to go ride for a few days...maybe we can meet up.

jhow66 · 08-18-2006, 03:28 PM

Quote:

Originally Posted by Premium72

ha...we'll see about that. you any where near deals gap? im going to plan a trip up there later in sept maybe to go ride for a few days...maybe we can meet up.

Nope. I live just outside Knoxville off I-40. Here's what one looks like in a '71:

08-16-2006, 09:44 AM	#1
Premium72 Registered User Join Date: Sep 2005 Location: Villa Rica Ga Posts: 889	Need Help with vibration. okay. so around 35 i get this pulsing fibration from the truck. its an all over kinda thing so i dont think its a tire /balancing issue(ive already rotated them with no change n the vibration). i pulled the drive shaft and replaced the center u joint(the rear is new an the front seemed to be in good shape.) the hanger baring isnt all that old and also seems to be in good shape. checkd the dope in the diff, and topped it off just for the heck of it. also when driving, when the vibration starts and i pop it in to neutral, it stops. but. if i rev the engine to a certian rpms(dont know what no tach installed) the vibration will continue. im not sure if this is in the drvie line(driveshaft to rearend) or in the engine or tranny. i checked all fluids and made sure everything was tight(engine, tranny, drive sahft rear end.) so im at a stant still now. ANY IDEAS??.. thanx. w.

08-16-2006, 10:08 AM	#2
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: Need Help with vibration. check your motor and tranny mounts __________________ 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

08-16-2006, 02:08 PM	#3
Premium72 Registered User Join Date: Sep 2005 Location: Villa Rica Ga Posts: 889	Re: Need Help with vibration. check as is replace? i put a wrench on em and gave a hell of a tug. not loose..think i may need new ones? would any thing internally cuase this? any help is greatly appreciated. thanx. w. Last edited by Premium72; 08-16-2006 at 02:08 PM.

08-16-2006, 02:22 PM	#4
70rs/ss Registered User Join Date: Dec 2004 Location: Northern AZ Posts: 7,271	Re: Need Help with vibration. What type of tranny do you have? This could be a motor or tranny thing if it vibrates in nuetral. Did it just start? More info will help us help you.

08-16-2006, 02:44 PM	#5
larry may Senior Member Join Date: Jul 2005 Location: MISSOURI Posts: 3,256	Re: Need Help with vibration. Found my problem with the fly wheel and clutch disc. Replace both problem went away

08-16-2006, 04:32 PM	#6
Premium72 Registered User Join Date: Sep 2005 Location: Villa Rica Ga Posts: 889	Re: Need Help with vibration. its a turbo 350, the problem stops when i bump it in neutral and just coast. but when i rev the motor it vibrates. ill look into the fly wheel issue. thanx. w.

08-16-2006, 04:54 PM	#7
Solver Registered User Join Date: May 2000 Location: Storm Lake, Ia Posts: 1,449	Re: Need Help with vibration. Had that problem just as you described and for me it was my torque converter was bad. __________________ 1972 Cheyenne Super 20 LWB-Blue 1972 Cheyenne Super 10 LWB-Black 1972 Cheyenne Super 10 LWB-Red 1972 Cheyenne Super 10 LWB-green 1972 GMC 4x4 LWB-White 1971 Cheyenne 10 LWB-Ochre 1971 Cheyenne 20 Longhorn-Copper 1971 Cheyenne 20 Longhorn-Black 1969 Custom 10 LWB-lt blue 1968 GMC 3/4 ton-green 1968 1/2 ton swb stepside-silver 1967 Chevrolet CST 10 LWB-green 1967 Chevrolet custom 20 LWB-Maroon

08-16-2006, 06:06 PM	#9
70rs/ss Registered User Join Date: Dec 2004 Location: Northern AZ Posts: 7,271	Re: Need Help with vibration. could be loose bolts on the flywheel, check that first.

08-16-2006, 06:08 PM	#10
Premium72 Registered User Join Date: Sep 2005 Location: Villa Rica Ga Posts: 889	Re: Need Help with vibration. cool.. ill look into it later this week.. was playn with it some more today. with the truck i park and given it gas and holdin it at a certian rpm(got no tach not sure what) it just shakes the hell outa the truck.ythis makes me think its sumthn with the motor-tranny or some where in b-tween. .ill play with the torque converter tomorrow or so..thanx fellas you never let me down!!..ROCK ON!!

08-16-2006, 10:36 PM	#11
Premium72 Registered User Join Date: Sep 2005 Location: Villa Rica Ga Posts: 889	Re: Need Help with vibration. OK. well i put a wrench on all the bolts to the fly wheel none loose, and gave em all a good tug for the hell of it. put a wrench on every bolt under neath,(engine mounts, tranny mounts, front crossmember, flywheel.) nuthn even lose. im starting to think it maybe my balancer. any thoughts on this? let me know. i may pull this bad boy apart in the next few days and install a new balancer. thanx. w.

08-16-2006, 11:24 PM	#12
Solver Registered User Join Date: May 2000 Location: Storm Lake, Ia Posts: 1,449	Re: Need Help with vibration. Do you mean the balancer on the front of the engine? Doesn't really explain why vibration goes away when in neutral then __________________ 1972 Cheyenne Super 20 LWB-Blue 1972 Cheyenne Super 10 LWB-Black 1972 Cheyenne Super 10 LWB-Red 1972 Cheyenne Super 10 LWB-green 1972 GMC 4x4 LWB-White 1971 Cheyenne 10 LWB-Ochre 1971 Cheyenne 20 Longhorn-Copper 1971 Cheyenne 20 Longhorn-Black 1969 Custom 10 LWB-lt blue 1968 GMC 3/4 ton-green 1968 1/2 ton swb stepside-silver 1967 Chevrolet CST 10 LWB-green 1967 Chevrolet custom 20 LWB-Maroon

08-17-2006, 12:11 AM	#13
Premium72 Registered User Join Date: Sep 2005 Location: Villa Rica Ga Posts: 889	Re: Need Help with vibration. how doesnt it. when im driving the truck, the vibration starts....ill pop in into neutral, let it coast no vibration. the motor has idled down and not in the same rpm range. it will also do this in park. rev the engine and holding it at the rpm's that vibrate the truck. im going to check more into it in the am. (not tryning to be a smart ass. this is just getting a bit frustrating.....just trying to think clearly and not smash sumthn with a wrench..hahaha. thanx as always. w. )

08-17-2006, 12:01 PM	#14
70rs/ss Registered User Join Date: Dec 2004 Location: Northern AZ Posts: 7,271	Re: Need Help with vibration. Balancer could be it, it makes the vibration at a certain rpm in gear or in nuetral or park, so it is engine rotating assembly related anything that spins with the crankshaft could be it, if not balancer, I'd really lean to thinking its the converter. It is pain in the ass, but you could pull the tranny and put a new stocker in there (pull the pan and look for metal, as converters usually frag when the do this), if there is metal, then have the tranny gone through. As long as the balancer is there it sould be ok, by the way have you pulled the plugs and run compression? This could be a high speed miss? I do not know if any of these are it, but any of them could be, hope something helps.

08-17-2006, 01:35 PM	#15
jhow66 Registered User Join Date: Jun 2002 Location: Knoxville Tenn. Posts: 3,058	Re: Need Help with vibration. Bent fan blade--remove belt and try it. __________________ 56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer

08-17-2006, 04:31 PM	#18
70rs/ss Registered User Join Date: Dec 2004 Location: Northern AZ Posts: 7,271	Re: Need Help with vibration. It could be? It will take like 5 min, unbolt it and run two bolts back in the pulley without the fan and run it to the rpm where the vibration usually is and see. I have a wicked vibration in my old truck, but I was running solid motor mounts, so it was to be expected. Did it just start all the sudden?



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08-17-2006, 04:53 PM	#19
Premium72 Registered User Join Date: Sep 2005 Location: Villa Rica Ga Posts: 889	Re: Need Help with vibration. the vibration has been there somewhat from the start of the buildup....but i would find things here and there that i overlooked and it would get better as i wrenched an tightend all my loose ends. took off the belt to the fan, still vibrates. still think it maybe the balancer, the ruber all around is pretty smooth but for one spot looks pretty ruff. it may have spun...what do you guys think? how do tell if a balancer has gone bad? thanx for all the help.

08-17-2006, 05:06 PM	#20
jhow66 Registered User Join Date: Jun 2002 Location: Knoxville Tenn. Posts: 3,058	Re: Need Help with vibration. See that didn't take long to check did it? 1--tells us what motor you have and what you did in it's buildup. 2--tells us if you started with a complete motor (did it come with the balancer and flexplate?) __________________ 56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer

08-17-2006, 06:37 PM	#21
rage'nrat638 Account Suspended Join Date: Mar 2003 Location: THE FALL GUY CHICAGO IL Posts: 5,883	Re: Need Help with vibration. well i got the same problem with my 69 now..i just got my flex plate and all new bolts from summit..85.00 i am waiting for my brand new converter and front seal from them now 80.00.. i am not pulling any thing apart and skipping a 80.00 part to have to do it all over again.. Last edited by rage'nrat638; 07-12-2007 at 07:02 AM.

08-17-2006, 09:15 PM	#22
Premium72 Registered User Join Date: Sep 2005 Location: Villa Rica Ga Posts: 889	Re: Need Help with vibration. 350. mild comp cam.(280 lift i b-leave), engine was in the truck when tore apart.was just stripped cleaned and a few new gaskets put in. hei dist. turbo 350 trany, thats about it. i looked at another balancer today in another truck. made me think even more its the balancer. the ruber in mine is f-ed up on one spot and looke like its coming out in another. ordered one today will be in in the morn. thanx again for the help...i think ill just put in a 502...hehehe..thanx. again. w. Last edited by Premium72; 08-17-2006 at 09:16 PM.

08-18-2006, 02:35 PM	#24
Premium72 Registered User Join Date: Sep 2005 Location: Villa Rica Ga Posts: 889	Re: Need Help with vibration. ha...we'll see about that. you any where near deals gap? im going to plan a trip up there later in sept maybe to go ride for a few days...maybe we can meet up.

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