Driveshaft Vibration
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Senior User
Joined: Oct 2004
Posts: 322
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Driveshaft Vibration
When I am going down the road I hear a droning noise. I have checked the ujoints and they are tight. I wonder if the drive shaft can be out of balanced. Is there any way I can tell without taking it to a shop?
Thanks. Jack
Thanks. Jack
Cargo Master
Joined: Aug 2004
Posts: 2,899
Likes: 2
From: Lynnwood, WA
You can jack up the car and the rear axle (make *absolutely* sure it's secure!!), run it at freeway speed and check the driveshaft -- if it's bent or unbalanced, you should see that when you hold something (i.e. chalk) close to the driveshaft. Of course, you need to be extra careful when doing this, and if you're not comfortable with it, just take it to a shop.
As for the noise, off-road treads can generate lots of noise.
As for the noise, off-road treads can generate lots of noise.
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Post Fiend
Joined: Dec 2003
Posts: 6,658
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From: "Islander"
Around 35-37 mph will be you primary vibration zone, on blocks as posted above feel the trans tail section and the rear pinion housing. Remember the stands will absorb alot at the rear axle. Add two stainless worm drive hose clamps 180 degrees apart and star moving them around to see if the vibration changes. Do you have alot of torque and twisted the welds at the yokes?
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Post Fiend
Joined: Dec 2003
Posts: 6,658
Likes: 4
From: "Islander"
The weight of two clamps when the worm screws are on the same side will make a noticeable difference as very little weight will throw a shaft out of balance. This is a simple no cost test or you can take it to a drive line balance shop and pay without knowing what the real problem was even though you need it balanced. Before you send it in install new joints as they will stick it to you in parts and labor. Use good joints by brand name.
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Cargo Master
Joined: Jun 2003
Posts: 2,982
Likes: 7
From: Somewhere Saskatchewan
Have a look at the driveline angle.
If it is off at either transmission or differential it can cause this affect,
If it is off at either transmission or differential it can cause this affect,
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Post Fiend
Joined: Dec 2003
Posts: 6,658
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From: "Islander"
Look at the pinion (nose down) on a 3/4 ton truck when empty, it's many degrees more than the front shaft to trans without vibration problems. This is designed by Ford without vibration problems. The above is bent shaft, twisted shaft, bad joints, yoke pushed to one side, loose tail shaft bushing with worn yoke or a balance weight broke off.
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Thread Starter
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Senior User
Joined: Oct 2004
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Would the side to side angle of the rear driveshaft make vibration? What I have is a c6 mounted in a 64 4x4. I used a 77 transmission cross member and bolted it to my frame using the radius arm mounts. So the transmission seems to be mounted in a good place with a slight angle, the tail down. It does look like the differential is not perfectly behind the tail of the transmission so there is a bit of side angle. I am starting to think that some of the noise may be coming from my tires as they are 33 x9.5 and the front ones are getting smooth. I appreciate the great info all of you are providing. There is nothing like "been there done that experience".
Jack
Jack