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BigAl Breland (aka BigAlBre) [ View ] [ Email ] [ Car Ads ] [ Blogs ] St Pete Beach, Florida (866) 787-6337  Big Al sittin back in paradise.

A friend has a 39 coupe with a vibration and they can't seem to find it. He said he checked the rearend, the driveshaft, u-joints,tranny, motor mounts, everything but couldn't find out what was causing it. Any ideas??? it's a sbc, auto, I told them to watch for this post so maybe we will get more information.... More information It vibrates when your rolling. When your going down the road it vibrates then calms down like when someone doesn't know how to steady the gas pedal, up and down. When your sitting still the car vibrates like it has a cam in it, which of course mine doesn't.

Comments

Posted by tazhog54  -  04/09/2008 10:43 PM Where does the vibration feel likes it coming from . Does it come and go with speed or engine rpm . Does it go away with braking or get less ? The most common mistake in streetrods is the driveshaft angle being out of line more than 4 degrees tazhog54 [ View ] [ Email ] [ Blogs ] [ Car Ads ] visalia, California   Posted by ljwillet  -  04/09/2008 10:44 PM have you checked pinion and tranny angles? this link may help. Key point to remember is EQUAL but OPPOSITE angles (example 3deg DOWN on tranny 3 deg UP on pinion) http://www.driveshaftshop.com/Vibration.ivnu ljwillet [ View ] [ Email ] [ Blogs ] [ Car Ads ] Auburn, New Hampshire   Posted by cr55  -  04/09/2008 10:49 PM Is the angle checked with the car sitting level? Does the size of the tires have any impact ? I thought that I knew it all , but.. [ View ] [ Email ] [ Blogs ] [ Car Ads ] dover, Delaware   Posted by Starfire  -  04/09/2008 10:52 PM Dumb questions........When does the vibration occur? Vehicle running but sitting still or only while the vehicle is moving? If the latter is it more intense at any particular speed or does it become worse as speed increases? Starfire [ View ] [ Email ] [ Blogs ] [ Car Ads ] Weimar, Texas   Posted by ljwillet  -  04/09/2008 10:55 PM this is checked at ride height wheels on the ground and level surface, a drive on lift would work too (where the tires are on a platform) ljwillet [ View ] [ Email ] [ Blogs ] [ Car Ads ] Auburn, New Hampshire   Posted by cr55  -  04/09/2008 10:56 PM I have a vibration in my rod too. It seems to get worse when you decrease speed. I thought that I knew it all , but.. [ View ] [ Email ] [ Blogs ] [ Car Ads ] dover, Delaware   Posted by Starfire  -  04/09/2008 11:48 PM cr55 are you talking about your ride or something else......(grin) Starfire [ View ] [ Email ] [ Blogs ] [ Car Ads ] Weimar, Texas   Posted by 37tin  -  04/10/2008 12:25 AM Hey STARFIRE your cracking my block here !! btw, don't type so fast I'm a slow reader,,,(big grin ) oh yeah, do I owe you a canadian dubloon for the f1 gas thing,,, how do ya come up with that stuff so quick anyway? 37tin [ View ] [ Email ] [ Blogs ] [ Car Ads ] langley, Canada   Posted by cr55  -  04/10/2008 06:38 AM I was talking about a 37 chevy because Eriq said to keep our discussions to cars only......lol Seriously, it's really getting old . doesn't vibrate too bad while driving, but it gets worse on deceleration. I don't feel it thru the steering wheel so I don't believe it's the front end or alignment. It's a 350/350 combo. Far from stock too. At the moment it has a 430 / 9" rear ( I like to be the first one from the red lite !.....big grin) that soon will be changed. I had a smaller gear in it before and it still had the same vibration. Any help on this will be deeply appreciated. I thought that I knew it all , but.. [ View ] [ Email ] [ Blogs ] [ Car Ads ] dover, Delaware   Posted by Crazyhorse Rod Shop  -  04/10/2008 08:08 AM vibration at a standstill is most likely the converter or cracked flex plate.. dont poke the porchdog........he bites [ View ] [ Email ] [ Blogs ] [ Car Ads ] BLUFF DALE, Texas Charter Member since March 2003   Posted by bigdude  -  04/10/2008 09:10 AM Or the wrong flex plate-like a 350 on a 400 or vice versa. resident know it all [ View ] [ Email ] [ Blogs ] [ Car Ads ] Three Rivers, Michigan Charter Member since January 2004   Posted by Starfire  -  04/10/2008 10:21 AM I'd be inclined to agree with Shine on the idea the problem is the torque converter. It's not at all uncommon for someone to get in a big rush in assembly and damage a brand new torque converter by virtually forcing it on to the transmission. B&M Torque converters are particularly sensitive to that type of treatment. Starfire [ View ] [ Email ] [ Blogs ] [ Car Ads ] Weimar, Texas   Posted by aosborn  -  04/10/2008 10:31 AM Like bigdude eluded to, it wouldn't happen to be a small block 400cid would it? They are externally balanced and if you get the wrong flex plate or harmonic balancer on it you will have problems. aosborn [ View ] [ Email ] [ Blogs ] [ Car Ads ] Olympia, Washington   Posted by Crazyhorse Rod Shop  -  04/10/2008 10:39 AM unbolt the converter from the flex plate and slide it back. if vibration is still there it is engine problem. if it stops you know it is converter. wrong flex plate will be really obvious as it will raise all kinds of hell. the vibration will change with rpm sitting still. a cracked flex plate is pretty common if you bought after market. dont poke the porchdog........he bites [ View ] [ Email ] [ Blogs ] [ Car Ads ] BLUFF DALE, Texas Charter Member since March 2003   Posted by RedricoAdelphianet  -  04/10/2008 11:36 AM maybe a defective engine fan if it even has a fan? RedricoAdelphianet [ View ] [ Email ] [ Blogs ] [ Car Ads ] Pittsburgh, Pennsylvannia   Posted by BigAlBre  -  04/11/2008 12:16 AM I saw the engine running tonight and the water pump pully was out of round... do you think that would do it.... at idle I didn't notice any significant vibration... Big Al sittin back in paradise. [ View ] [ Email ] [ Blogs ] [ Car Ads ] St Pete Beach, Florida Charter Member since June 1999   Posted by Starfire  -  04/11/2008 01:49 AM I'd think a pulley being out of round would cause one heck of a vibration, not to mention shortening the life of the belt and water pump. Are you sure it is out of round and not just an optical illusion? If it is out of round by much it would be nearly impossible to keep the proper tension on the belt. You didn't mention if there is a serpentine belt or multiple V-belts involved. If a serpentine, the tensioner will not be long for this world if there is a pulley out of round, but then a tensioner would absorb an awful lot what might be a vibration with V-Belts. Starfire [ View ] [ Email ] [ Blogs ] [ Car Ads ] Weimar, Texas   Posted by cr55  -  04/11/2008 12:22 PM Hey guys, are any of these responses aimed at my problem? I'm not sure. Thanks for any help you can give me. ...........CR I thought that I knew it all , but.. [ View ] [ Email ] [ Blogs ] [ Car Ads ] dover, Delaware   Posted by Crazyhorse Rod Shop  -  04/11/2008 12:50 PM all chrome water pumps wobble al. cheap crap from china . if you want it straight get out your bfh. main reason i use billit. dont poke the porchdog........he bites [ View ] [ Email ] [ Blogs ] [ Car Ads ] BLUFF DALE, Texas Charter Member since March 2003   Posted by dixie  -  04/11/2008 09:39 PM SHINE IS RIGHT, ITS NOT OUT OF ROUND ,ITS JUST NOT RUNNING TRUE EITHER BENT ARE WARPED SOME ARE JUST CHEAP JUNK LOOKING FOR RUST. ARE U MAY HAVE IT PULLED IT DOWN CROOKED. AL DOES THIS CAR HAVE SOLID MOTOR MOUNTS BY ANY CHANCE ? DIXIE---- W & S----- jim grace [ View ] [ Email ] [ Blogs ] [ Car Ads ] dade city, Florida Charter Member since January 2006   Posted by BigAlBre  -  04/12/2008 12:17 AM Dixie not sure about the motor mounts, I'll have a chance to look today, Shine it looks like one of those chinese pieces of crap, V belt not serpentine.... Big Al sittin back in paradise. [ View ] [ Email ] [ Blogs ] [ Car Ads ] St Pete Beach, Florida Charter Member since June 1999   Posted by amrodder  -  04/12/2008 11:13 AM I had a vibration problem with my 32 coupe.Had the angle checked,took out the drive shaft twice and sent it off for rebalancing,both times after this was done it still vibrated.My vibration was at 55mph and hardly any before that.Rebalance the tires but still had vibration.Fianlly had a friend come over who drag races,he measured the shaft and it was 1/4" too long in the tail shaft.Got a new drive shaft cut,problem solved. amrodder [ View ] [ Email ] [ Blogs ] [ Car Ads ] Chester, Illinois   Posted by sellersrodshop  -  04/13/2008 09:47 AM al, please post the solution when you find the cause. i have two vehicles here that do the same thing. a "cyclic" vibration above 40-45 mph. one of mine has been highly modified as far as suspension & driveline, the other is bone stock with the exception of a 3.73 auburn pos. center section. both have new wheels & tires (properly balanced) & not an engine vibration, just seems to occur at steady cruising speeds. sellersrodshop [ View ] [ Email ] [ Blogs ] [ Car Ads ] old hickory, Tennessee

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