[Glennk]

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

[Henry Highrise]

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.

[Glennk]

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

[johnsongrass1]

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?

[Glennk]

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

[Henry Highrise]

When you say you changed the gear...what do you mean? The ring and pinion?

[Glennk]

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

[brainsboy]

Check the rear trans mount

[bracketeer]

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.

[Henry Highrise]

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.

[Glennk]

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

[scholman]

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

[Glennk]

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