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Old 11-25-2013, 03:49 PM
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Drive shaft rebalance?

When I removed the drive shaft eons ago, I did not pay attention to the phasing of the shaft in relation to the trans or pinion yokes. I replaced the u-joints and slapped everything back together. The trans yoke does not have an indexing spline or flat spot, so there is nothing to line up. I have noticed some vibrations while driving and am thinking this might be the culprit.

I called a local shop and they said that since I replaced the u-joints the system is now out of balance and they would gladly take $100 to fix it. I have also heard that u-joints are neutral balance and no need to worry. Advice?

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Old 11-25-2013, 03:54 PM
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Unless it's a two piece shaft not counting the pinion there is nothing to set for balance. It doesn't matter where the shaft goes into the transmission or rear end.

You best bet is to have it re-balanced. I've always taken my stuff to Catco. It's been a while and maybe prices have gone up but I don't remember them being that expensive to just balance a shaft.

Last resort you could try flipping the yoke 180 but I doubt that would do anything.
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Old 11-25-2013, 04:28 PM
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i would think it is some where else have change 100's of u-jays thru the years and never had a problem.
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Old 12-23-2013, 02:29 PM
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I betting the needles have fallen out and are trapped between the cap and cross upon installation. Everything fits ok but just one needle will cause the shaft to not seat properly and vibrate.
My personal opinion says DV balance is Hocus Pocus meant to sell something it doesn't need.
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Old 12-23-2013, 04:27 PM
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You didnt say what kind of vehicle it is. GM trucks are very sensitive to drive shaft balance. It is always a good idea to mark the shaft when you take it out to get it back in the same way.
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Old 12-23-2013, 04:50 PM
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Is the vibration in the steering wheel or do you feel it in the seat?
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Old 12-23-2013, 05:32 PM
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Quote:
Originally Posted by johnsongrass1 View Post
I betting the needles have fallen out and are trapped between the cap and cross upon installation. Everything fits ok but just one needle will cause the shaft to not seat properly and vibrate.
My personal opinion says DV balance is Hocus Pocus meant to sell something it doesn't need.
I have to agree with you on the balance issue. I worked in a shop that built hundreds of drive shafts over the years.We had no balancing equipment,and very rarely had a problem.If the shaft is properly phased and true when welded there is seldom any problem with drive shaft vibration.We used to re-tube lots of shafts that were clamped in a vise while some"mechanic" was hammering the U-joints out.U-joints are a pretty simple job that people seem to mess up.(Not referring to the OP)
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Old 12-24-2013, 10:37 AM
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My drive shaft guy who's been building shaft for 6o years says he checks the balance of a shaft by spinning it in the lathe to 10k rpm. If it doesn't fly out then its good to go whether steel, aluminum or carbon fiber. I've seen other shops charge a guy $100 and yet there are no witness marks that anything has been done.

A typical steel shaft has very small MOI and it would have to be very very heavy on one side to vibrate. Critical whipping rpm is something seldom discussed but should be because the symptoms seem the same.
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