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Old 11-09-2005, 06:43 PM
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Driveshaft balance

If my driveshaft was out of balance, what kind of vibrations would I feel in the car? I have a vibration in the car most noticeable under acceleration. It is a very tight vibration. I am getting concerned that I may be found on the side of the road if you know what I mean..Help is appreciated....Thanks....Glenn

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Old 11-09-2005, 06:49 PM
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Sometimes a U-joint will vibrate rather than making a poping or clicking noise so check those out. Also a rear axle bearing will cause a pretty good vibration also. You could also have a bad or a loose trans mount. It could be any number of things, you will just have to look untill you find it.
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Old 11-09-2005, 07:01 PM
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Driveshaft

I just recently changed the gear in the 9 inch and in the process I found the rear u joint was bad so replaced it I guess I will have to get it up on stands and start checking things out. Thanks for the ideas. I just don't remember it being there before I changed the gear but then again I haven't had it on the road that long. I know that it takes some driving before you feel all the little idiosyncrosies of the car...Thanks again..............Glenn
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Old 11-10-2005, 09:43 AM
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U joint's and drive shaft balance are usauly pretty constant once that rpm is reached. Try shifting to neutral while doing 45 or so and see what happens. get worse or better?
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Old 11-10-2005, 02:50 PM
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Driveshaft

I will try that. I don't know why I didn;t think of that...Thanks...All ideas are very appreciated. The old saying two minds better than one .....or more....Glenn
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Old 11-10-2005, 03:12 PM
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When you say you changed the gear...what do you mean? The ring and pinion?
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Old 11-10-2005, 03:39 PM
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9 inch gear

No, I have 3 different center sections. I have 1 with 2.75 ratio 1 with 3.25 and 1 with 3.56. I had the 2.75 in and took it out and put the 3.25 in. The gear set was all reset and fresh bearings etc. If I can't find what the prob. is with certainty, I will pull the pig out and put the 2.75 back in and go from there. Hate to do that tho cause its ajob for an old guy....That will be my last resort...The 3.56 needs to be rebuilt so thats out for now....Glenn
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Old 11-10-2005, 04:00 PM
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Check the rear trans mount
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Old 11-10-2005, 04:30 PM
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I had a bent drive shaft. There was no vibration at all. I found out it was bent because I would get a bit of spray out of the pinion seal.
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Old 11-10-2005, 04:57 PM
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Another thing you might check is the nut holding the yoke on the pinion shaft. It might be a little loose. Just a thought. Also jack the car up and turn the rear wheels by hand and see if you can feel or hear anything, a axle bearing starting to go out will vibrate also.
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Old 11-10-2005, 05:21 PM
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axle bearings

All good ideas. I think I may just pull the axles and put new bearings on them and eliminate that potential...I'm pretty sure the center nut is tight but I will check anyway....Thanks............Glenn
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Old 11-10-2005, 06:25 PM
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Glen,

This is a long shot but once I installed new U-joint on a van and I was under the darn thing for hours it seemed. Anyway I got it back to gether and took her for a spin and I had a vibration. Not bad but there. I checked everything I could thing to check. I could not figure it out. So I put it up on jack stands so the rear wheels were off the ground and put her in high gear and let it idle. I could not believe my eyes! I had put the rear U-joint off to one side of the yoke so it would "whip" around instead of rotate in a nice circle. Because there is a centering tab on the yoke I had to buy another U-joint because the cap on that side was dented.

Just another thing to check, right?

Scholman
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Old 11-10-2005, 08:52 PM
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Driveshaft

You know, I've been thinking about that also. I've been second guessing myself about that. Needless to say that the first thing I get it in the air, I'm checking that....Thanks......Glenn
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