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Old 05-03-2009, 06:14 PM   #1 (permalink)
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Hose clamp method of balancing driveshaft

My driveshaft has had a hose clamp on it the entire time I've owned the car. When changing ujoints I left it alone as I thought it was there as a weight for balancing. After doing some looking around at info on balancing a driveshaft I found this. Guess my thoughts were correct. Who knows what method or who did it though.

Deb

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If you’re using an on-car balancer, place the magnetic pickup head just behind the pinion nose under the axle housing and the strobe light under the rear of the driveshaft. Draw a chalk line on the shaft for a reference mark. Then run the shaft up to speed and note the relative position of the mark when it is illuminated by the strobe. The strobe will flash when the heaviest part of the driveshaft is at the six o’clock position (straight down).

To correct the imbalance, install worm screw hose clamps on the shaft with the heavy part of the clamps positioned 180 opposite the heavy spot. Then run the shaft back up to speed to see if additional weight is needed to cancel out the vibration.

Add more clamps as needed or weld a small chunk of iron to the shaft opposite the heavy spot. Repeat until the vibration is eliminated.
If you don’t have an on-car balancer, install a pair of hose clamps on the shaft and make four reference marks 90 apart. Try the clamps at each of the various positions until you find the one that produces the least amount of vibration.
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Old 05-03-2009, 06:25 PM   #2 (permalink)
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Re: Hose clamp method of balancing driveshaft

Deb, we at the dealer would install the hose clamp and not totally tighten it. We would run the car on jack stands at the speed of the vibration. We would lightly tap it with screwdriver. We would do this till the vibration would get better or go way. It worked Ok.
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Old 05-03-2009, 06:33 PM   #3 (permalink)
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Re: Hose clamp method of balancing driveshaft

What you mean by tapping it with a screwdriver is to rotate the clamp just a little bit at a time?

I'm going to get under there and make sure the ujoints are centered like they should be. Even though there are those little stops and the clips at the end of the caps you just never know. Also going to try unbolting it and rotating it and reconnecting and see if it makes a difference. I've heard in the past of people doing this and have heard you should mark them so you put the driveshaft in the same as before. But in my case it wouldn't have worked since I swapped 3rd members.

Last edited by ShotRod64; 05-03-2009 at 06:35 PM.
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Old 05-04-2009, 02:44 AM   #4 (permalink)
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Re: Hose clamp method of balancing driveshaft

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Originally Posted by ShotRod64 View Post
But in my case it wouldn't have worked since I swapped 3rd members.
Hey mon Deb,
I don't know if you remember, but some time ago (before I did the 4100 rebuild) I was looking all over for the "build-sheet", and found a quite large and very strange looking piece of iron under the back seat of the 3.14. I took a picture of it and posted it, and Mr. KULTULZ identified it as a "harmonic balancer" that had originally been on the shaft coming out of the differential! The rubber was deteriorated, and obviously it had come loose, and who knows who removed it and put it under the back seat? Not that this has anything to do with you balancing the ShotRod's drive shaft, but I had not seen anything like this before or since. I still have that piece.

Hope you are well.

JC
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Old 05-04-2009, 05:34 AM   #5 (permalink)
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Re: Hose clamp method of balancing driveshaft

Yes just to tap to get it to move a little. If it gets better but not perfect we would add a second. In my shop now I send them out to the drive shaft shop and let them do it.
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Old 05-04-2009, 06:25 AM   #6 (permalink)
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Re: Hose clamp method of balancing driveshaft

Right now if I had to go a certain speed for the vibration while on a lift or anything it wouldn't work as a gps only works when you move. I'll probably call around today and see what it's gonna cost and take it in if I can.

I take the car in for the finally trans check today to start the warranty and then I can start messing with stuff. I went through my old reciepts and found the speedo cable I bought before that was too long and it was 70" so I know to get the 60" that everyone sells but if I remember correctly mine was only like 52". But at least with the 60" I won't have to make loops and everything else to take up the slack! lol

JC, the 8.75 rearend I had off the 4 door Gal my dad and I parted out had that balancer thingy on there. Mine doesn't have that and neither did the other 9" out of a Galaxie that I had and should of kept did. It was out of a 2 door. I just wonder what designates if they have one or not. Is it a 4 door thing or just a luck of the draw?
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Old 05-04-2009, 06:59 AM   #7 (permalink)
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Re: Hose clamp method of balancing driveshaft

Deb, It's Honestly Best to Take it off and Have a Drive Shaft Shop Balance it. Its not Expensive and Gives Better Results.
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Old 05-04-2009, 08:16 AM   #8 (permalink)
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Re: Hose clamp method of balancing driveshaft

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Deb, It's Honestly Best to Take it off and Have a Drive Shaft Shop Balance it. Its not Expensive and Gives Better Results.

Back in the 1970's Hot Rod magazine also mentioned this routine. But they used those stick on lead wheel weight. Then gave up, and went to a shop as mentioned and it was done in less the 1/2 hour.

I find also that often times it is aiming at some other situation like near pooped out U-joints. But you mentioned looking at them already. Fix them, and the vibration is gone.



Wm.
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Old 05-04-2009, 08:36 AM   #9 (permalink)
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Re: Hose clamp method of balancing driveshaft

This balancer ring- you mean on the front driveshaft yoke?

My 68 had one- and shes a 2 door formal roof. Surprisingly it was still intact, i chuckled and tossed it anyways- i heard the bomb ticking...

As far as the driveshaft goes- I had one cut down and welded up, balanced too, for 100 bucks. I wouldnt think balancing could cost more than 35 or 40? I mean for 100 they had to cut it, clean all the old weld and tubing off the yoke, clean that up, slip it in, weld it, then balance. Balancing if they arent busy is likely a while-you-wait type thing?

I will be having a new shaft made when the 9" goes in- I would love to use the aluminum one I have but apparently no driveshaft shops hire people who can MIG aluminum... I should go apply!
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Old 05-04-2009, 08:56 AM   #10 (permalink)
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Re: Hose clamp method of balancing driveshaft

The balance thingy JC mentioned is on the third member yoke.

Hey yeah, go apply! Sounds like they need someone that can do something different in there.

I'm not going to attempt to balance mine myself. My dad knows how to do it out of the car but not sure what he uses or anything. But he's miles from here and I'd never make it, not to mention the gas would cost me more than having it done locally! lol

The rear ujoint is fairly new, the front is new. I didn't have any problems til i swapped 3rd member and trans, oh and slip yoke along with the front conversion joint so probably need the drive shaft balanced. I hope it's that. If not and it's the 3rd member I'll just have to stay off the freeway til I have the cash to find another. I want to dump that one and go back to a 3.00 anyway. It doesn't vibrate til I hit about 50-55 mph. Nowhere I drive usually is that fast til I get on the freeway.
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Old 05-04-2009, 09:06 AM   #11 (permalink)
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Re: Hose clamp method of balancing driveshaft

If it's nice and smooth and then suddenly goes into a harsh vibration at fairly specific higher speeds, it's usually a worn tranny output (yoke) bushing or differential pinion support bearing. You can sometimes lay under the car and push up hard near the U-joints to find the play.

David
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Old 05-04-2009, 09:26 AM   #12 (permalink)
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Re: Hose clamp method of balancing driveshaft

The tranny was just rebuilt so probably the other end which I probably messed up swapping yokes or it was already like that. It was out of another car and no idea of it's condition. Although the gears didn't appear to have any wear.

I want to find a 3.00 to put in and found one for $25 but it didn't have a yoke either and not doing that again, want something I don't have to mess with and mess up possibly by swapping things around! My yoke is 7-9 inches out from the 3rd member and the one on the one I got was only maybe 6 inches.

The good part is I can go around corners without spinning one tire and with the trans redone I can back out of a parking space no matter how hard the wheels are cramped.

Just need to stay off the freeway til I have the cash for another 3rd member.
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Old 05-04-2009, 09:41 AM   #13 (permalink)
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Re: Hose clamp method of balancing driveshaft

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Originally Posted by ShotRod64 View Post
The tranny was just rebuilt so probably the other end ...
I'd check anyway, you'd be amazed how many rebuilt trannies don't have their bushings replaced. Seriously. Plus, if you have an imbalance, it may have wobbled-out the previously OK bushing. Only takes a minute to verify.
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Old 05-04-2009, 10:50 AM   #14 (permalink)
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Re: Hose clamp method of balancing driveshaft

I was under there this morning and couldn't get the front end to move but still have to go to the rear and see what happens. I took it in to the tranny shop and he asked if I could come back tomorrow as he had 10 cars dropped off over the weekend. No shortage of work there!
I pick up the speedo cable tomorrow also which is just down the street so no biggie on going back again. I'll check the tail end sometime today and see what i get.
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Old 05-04-2009, 04:52 PM   #15 (permalink)
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Re: Hose clamp method of balancing driveshaft

Deb, I noticed that you had changed both the tranny and the rear-end. Something that you may want to check is the driveshaft angle and the pinion angle. It only takes a couple degrees off and it will cause a vibration. For driveshaft balancing, I have used Drivelines Northwest in Seattle with good results. That may be a bit far for you though.
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