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Old 01-05-2002, 11:08 PM
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Lightbulb drive line vibration

i have a 60 chevy biscayne with 2 pc drive shaft i had it balanced and new center bearing and univeral joints installed. but it still has a slite intermentant vibration at about 60mph any suggestions on what it might be.

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Old 01-06-2002, 07:29 AM
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Check your output shaft on the tranny. Drop the drive shaft wiggle the output shaft. It should be pretty tight if it's sloppy that could be your trouble.
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Old 01-06-2002, 08:37 AM
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I know this will sound crazy, but I had a 69 Camaro and found out by trail and error that if the driveshaft was not installed in the original alignment with the yoke it would vibrate. Unbolt the driveshaft at the yoke and rotate it 180. It's simple, it's painless, it's to good to be true, but hey, I know it worked.
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Old 01-09-2002, 10:43 AM
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[quote]Originally posted by biskwik:
[QB][/QB]<hr></blockquote>

THANKS I WILL GIVE IT A SHOT
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Old 01-25-2002, 06:04 PM
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You need to check the various angles within the driveline. A driveline will have an induced vibration whenever the angle of entry and exit are not complementary. A little hard to explain without a picture, but lets say that your transmission output shaft is exactly level and the input shaft of the differential was exactly level but the engine sat higher than the differential, the two angles at the u-joint would be exactly equal, one a positive angle and the other negative. The complementary angles cancel each other in rotation constantly and there is no vibration. If one of the angles is changed, say because your differential has moved do to twist under acceleration, you may get vibration. You can get away with the two angles being about 3 degrees different but not much more. The same goes for lateral alignment. Usually the problem is at the rear because the transmission is difficult to change, but the rear end can get lose. I know you said you had a two piece driveline, so this means that you also need to check the mounting of the center U joint. If it is in a rubber carrier, I have seen this get distored over time. I once had a car that had a rubber center section that I had to reverse every year or so because it would get distorted. The reversal would solve the vibration which was typically at about highway cruise speed. Very anyoing. Good luck
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Old 01-30-2002, 06:47 AM
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Dont forget the simple things.Trans mount soaked in oil?? Maybe kinda old. Also make sure no one droped a neeedle out of the u-joints. Its allways the simple thing that get yah.
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Old 01-30-2002, 09:47 AM
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In the last year I have been involved in 3 differant cars of this kind. They have all turned out to be bad bushings in the rear links. This lets the rear end change angle while going down the road. have a look at the bushings in the rear sup. ROY
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Old 01-31-2002, 05:01 AM
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One common error when re-installing a drive shaft is over tightening the c-clamps on the rear universal/pinion yoke. This will definitely cause a vibration. The correct torque on these clamps is 17 foot-pounds. Just yanking on a wrench will over tighten them every time.
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Old 01-31-2002, 07:15 AM
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CHECK THE REAR BUSHINGS. ROY
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Old 02-04-2002, 01:47 AM
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A common mistake made on multiable piece drivelines especially early GM 2-piece is phasing. The u-joint caps must be turned exactly 90 degrees from the preceeding driveline section. try it --it might be the problem.
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Old 02-22-2002, 02:16 PM
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The problem with vibrations or harmonics inside your car could be plenty of things. Fromwhat ive read all the suggestions are bang on.But if this is still a problem check for bad wheel bearings or even a tire with a flat spot or out of balance. These things are sometimes overlooked, but i have been bitten by them both! Vibrations or harmonics are very difficult to pinpoint and sometimes you will swear that the noise is coming from the rear when really it is coming from the front.
good luck
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Old 02-22-2002, 08:08 PM
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one other suggestion...if it is an automatic trans, try taking the torque converter bolts out, rotating the torque converter either direction to the next set of holes, and bolt it back up...may sound stupid, but it might also make your vibes go away...
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