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

LOHRTBT · 03-18-2008, 04:21 PM

So when I am either sittin in the driveway, if I rev the engine slowly there is a slight vibration you feel in the truck. Same thing when I am accelerating.. Its really there all the time but only notice it when I am accelerating from a stop or going uphill.

Any ideas on what it might be causing it? Dont remember it doing it on the test drive but I was pretty excited about its condition so I might have overlooked it lol.

All I have done it wash the engine bay off like usual...but its running fine otherwise. Just changed the plugs and wires so that is out of the question. Think maybe its the harmonic balancer??

Also..when going in reverse...the tranny goes squeak...squeak....squeak...squeak...until I put it in neutral...sometimes does it at low speed in drive also. what is this?? lol I am about to get the leak fixed and have the trans flushed and cleaned So It would be good to know while we are working on it in order to fix this.

Malo83 · 03-18-2008, 08:41 PM

Sounds like a Torque converter starting to go bad, pull the inpection plate off the bottom and have a look at the converter and check the torque on the bolts, had this happen to mine.

Malo83 · 03-18-2008, 08:42 PM

Sounds like a Torque converter starting to go bad, pull the inspection plate off the bottom and have a look at the converter and check the torque on the bolts, had this happen to mine.

LOHRTBT · 03-18-2008, 09:11 PM

I thought that too..but it wouldnt do it while in park if it were the convertor correct?

swb85 · 03-18-2008, 09:56 PM

The converter spins no matter what gear you're in....if the engine is running, the converter is spinning. If it's vibrating while you're parked in the driveway, a good way to test is to unbolt the 3 bolts that hold the converter to the flexplate. If the vibration goes away with the converter unbolted you've found the problem. If it still vibrates, it's coming from the motor.

zombiescustoms · 03-18-2008, 10:01 PM

U Joints will cause the squeek but if the vibration is there sitting still it also might be the harmonic balancer, I just checked my Burb and I think my balancer has spun, I too have a vibration and When I checked the timing it was 22* advanced, put it back to 4* and it would barley run!! Put her on TDC#1 and check the timing marks.

LOHRTBT · 03-18-2008, 10:02 PM

Quote:

Originally Posted by zombiescustoms

U Joints!!!!

Now i know that U joints dont spin while in park lol.

zombiescustoms · 03-18-2008, 10:07 PM

I hit post before I finished!

LOHRTBT · 03-18-2008, 10:36 PM

Gotcha haha!!

Ok so maybe just need some U joints for the tweety bird in my driveline hehe.

I am kinda leaning towards torque convertor or harmonic balancer also.

**old Rusty C10** · 03-19-2008, 02:48 AM

i had a noise like that and they changed the torque convertor and flex plate no more noise after that apparently the convertor got loose and egged out the holes for the flex plate and there was somethng in the convertor too

Prerunner1982 · 03-20-2008, 02:00 AM

HOLY CRAP your back.... whats up bro? Glad to see you didnt forget about us here. Hope things are going well. Sorry I dont have an answer for you though..

87 STEPPER · 03-20-2008, 07:34 PM

Dave it sounds like the converter or the flex plate threw a weight they both have balance weights spot welded to them and i'v seen them go by by on both.....not at the same time and not on the same vehicle but it happens.

If you look at them you can usually tell if one of them has departed from it's spot plus if you see the weight then you can eliminate that being the prob.

Good luck.

03-18-2008, 08:41 PM	#2
Malo83 Cruzzzn' Vet Join Date: Jan 2005 Location: Porterville,Ca. Posts: 1,918	Re: Vibration on acceleration?? Sounds like a Torque converter starting to go bad, pull the inpection plate off the bottom and have a look at the converter and check the torque on the bolts, had this happen to mine. Last edited by Malo83; 03-18-2008 at 08:45 PM. Reason: delete

03-18-2008, 08:42 PM	#3
Malo83 Cruzzzn' Vet Join Date: Jan 2005 Location: Porterville,Ca. Posts: 1,918	Re: Vibration on acceleration?? Sounds like a Torque converter starting to go bad, pull the inspection plate off the bottom and have a look at the converter and check the torque on the bolts, had this happen to mine.

03-18-2008, 09:11 PM	#4
LOHRTBT BeWarE tHe eViL CrAnkTOe! Join Date: Oct 2002 Location: Yukon, OK Posts: 3,605	Re: Vibration on acceleration?? I thought that too..but it wouldnt do it while in park if it were the convertor correct? __________________ ~Dave~ You can call me Mike, Mike Oxlong - 1986 Chevy SWB - Stock for now - *1986 Chevy Custom SWB* *Stolen 6/26/05* - 1985 Chevy SWB SOLD - 1999 T/A Some mods www.cardomain.com/id/ramairdave AIM Screenname - Jester84

03-18-2008, 09:56 PM	#5
swb85 On a budget like Fred Sanford Join Date: Oct 2005 Location: Topeka, KS Posts: 2,031	Re: Vibration on acceleration?? The converter spins no matter what gear you're in....if the engine is running, the converter is spinning. If it's vibrating while you're parked in the driveway, a good way to test is to unbolt the 3 bolts that hold the converter to the flexplate. If the vibration goes away with the converter unbolted you've found the problem. If it still vibrates, it's coming from the motor. __________________ '85 Silverado swb: 383 stroker, 10.5:1, vortec heads, 232/238 roller cam, RPM air gap, performer 750 carb, stainless longtubes, 3" duals/super 44's, T56/4.11 383ci build / exterior refresh thread '98 Camaro z28: 370ci twin turbo 370ci build '01 Tahoe LT 4x4: 5.3, longtubes/ory, magnaflow duals, custom tune....wife's DD

03-18-2008, 10:01 PM	#6
zombiescustoms Registered User Join Date: Mar 2008 Location: Abingdon, MD Posts: 74	Re: Vibration on acceleration?? U Joints will cause the squeek but if the vibration is there sitting still it also might be the harmonic balancer, I just checked my Burb and I think my balancer has spun, I too have a vibration and When I checked the timing it was 22* advanced, put it back to 4* and it would barley run!! Put her on TDC#1 and check the timing marks. Last edited by zombiescustoms; 03-18-2008 at 10:05 PM.

03-18-2008, 04:21 PM	#1
LOHRTBT BeWarE tHe eViL CrAnkTOe! Join Date: Oct 2002 Location: Yukon, OK Posts: 3,605	Vibration on acceleration?? So when I am either sittin in the driveway, if I rev the engine slowly there is a slight vibration you feel in the truck. Same thing when I am accelerating.. Its really there all the time but only notice it when I am accelerating from a stop or going uphill. Any ideas on what it might be causing it? Dont remember it doing it on the test drive but I was pretty excited about its condition so I might have overlooked it lol. All I have done it wash the engine bay off like usual...but its running fine otherwise. Just changed the plugs and wires so that is out of the question. Think maybe its the harmonic balancer?? Also..when going in reverse...the tranny goes squeak...squeak....squeak...squeak...until I put it in neutral...sometimes does it at low speed in drive also. what is this?? lol I am about to get the leak fixed and have the trans flushed and cleaned So It would be good to know while we are working on it in order to fix this. __________________ ~Dave~ You can call me Mike, Mike Oxlong - 1986 Chevy SWB - Stock for now - *1986 Chevy Custom SWB* *Stolen 6/26/05* - 1985 Chevy SWB SOLD - 1999 T/A Some mods www.cardomain.com/id/ramairdave AIM Screenname - Jester84

03-18-2008, 10:07 PM	#8
zombiescustoms Registered User Join Date: Mar 2008 Location: Abingdon, MD Posts: 74	Re: Vibration on acceleration?? I hit post before I finished!

03-18-2008, 10:36 PM	#9
LOHRTBT BeWarE tHe eViL CrAnkTOe! Join Date: Oct 2002 Location: Yukon, OK Posts: 3,605	Re: Vibration on acceleration?? Gotcha haha!! Ok so maybe just need some U joints for the tweety bird in my driveline hehe. I am kinda leaning towards torque convertor or harmonic balancer also. __________________ ~Dave~ You can call me Mike, Mike Oxlong - 1986 Chevy SWB - Stock for now - *1986 Chevy Custom SWB* *Stolen 6/26/05* - 1985 Chevy SWB SOLD - 1999 T/A Some mods www.cardomain.com/id/ramairdave AIM Screenname - Jester84

03-19-2008, 02:48 AM	#10
old Rusty C10 Robert Olson Transport Join Date: Oct 2002 Location: recent transplant to NC USA Posts: 20,310	Re: Vibration on acceleration?? i had a noise like that and they changed the torque convertor and flex plate no more noise after that apparently the convertor got loose and egged out the holes for the flex plate and there was somethng in the convertor too __________________ 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!!

03-20-2008, 02:00 AM	#11
Prerunner1982 Registered User Join Date: Oct 2002 Location: Edmond, OK Posts: 5,904	Re: Vibration on acceleration?? HOLY CRAP your back.... whats up bro? Glad to see you didnt forget about us here. Hope things are going well. Sorry I dont have an answer for you though.. __________________ Jon 1982 Chevy Silverado 350/th350.... RETIRED 1993 Jeep XJ 2 door(Cherokee) 4wd 4.0ltr/AX-15 (5spd)/NP231 .... Oklahoma Roll Call

03-20-2008, 07:34 PM	#12
87 STEPPER STILL PLAYS WITH TRUX Join Date: Nov 2002 Location: Melbourne, Fla. Posts: 2,764	Re: Vibration on acceleration?? Dave it sounds like the converter or the flex plate threw a weight they both have balance weights spot welded to them and i'v seen them go by by on both.....not at the same time and not on the same vehicle but it happens. If you look at them you can usually tell if one of them has departed from it's spot plus if you see the weight then you can eliminate that being the prob. Good luck. __________________ ~~Bruce~~ MY 87 STEPPER MY 99 2D/WD TAHOE

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