I can feel the driveshaft vibrations at speed and also there's a kind of hum at exactly 40mph which then disappears. Can these driveshafts be straightened?
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Originally posted by plee4139 View PostI can feel the driveshaft vibrations at speed and also there's a kind of hum at exactly 40mph which then disappears. Can these driveshafts be straightened?Gary L.
Wappinger, NY
SDC member since 1968
Studebaker enthusiast much longer
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I'm curious why you think it's driveshaft. Is it because you feel it in the seat and not the steering or other reasons. I only ask because vibrations at a given speed are sometimes a bear to track down. While I don't disagree with the diagnosis, a lot of parts can get thrown at a problem before it's resolved.
As we don't know how long it's been an issue, it might be the time to switch a few wheels around etc.
Bob
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Originally posted by sweetolbob View PostI'm curious why you think it's driveshaft. Is it because you feel it in the seat and not the steering or other reasons. I only ask because vibrations at a given speed are sometimes a bear to track down. While I don't disagree with the diagnosis, a lot of parts can get thrown at a problem before it's resolved.
As we don't know how long it's been an issue, it might be the time to switch a few wheels around etc.
BobI agree with Bob. I was just directly answering your question. I suggested CHECKING your U-joints, not necessarily replacing them, unless really needed. Have your U-joints been regularly lubricated? A binding joint can cause problems. Of course at that point it probably needs to be replaced. Carefully look over your tires - inner, outer, tread area.Gary L.
Wappinger, NY
SDC member since 1968
Studebaker enthusiast much longer
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When you say there is a hum at 40MPH it brings back memories of the same thing I had on my first 57 T-Bird. Traced it to a bad rear wheel bearing. I don't remember a serious vibration with that. Like others said, finding a vibration is a hit and miss series of trials unless you get real lucky. I would also check U-Joints first. Usually a U-Joint will make noise or vibrate under load and quit when coasting.sigpic1966 Daytona (The First One)
1950 Champion Convertible
1950 Champion 4Dr
1955 President 2 Dr Hardtop
1957 Thunderbird
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"Huming" sound/feeling is usually a bearing, but if you don't mind getting your own backside on the ground you could crawl under & put one hand on either side of a U-joint & maby feel a play, but it's probably a small one so consentrate on it.
For wheel bearing; lift one wheel & spin it while holding on to the axel as far out to the wheel as possible. Front bearing you can feel play by rocking it out-in when gripping under & top of the wheel.
Also check the in-going on the rear axel, I've had cars with quite a play there...
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I always start with the basics- did you lose a tire weight ?, lug nuts tight?, air pressures? Brake shoe dragging? center support rubber bushings. .... Check the Diff fluid too. The front pinion bearing will hum if they are low or going bad. You can 'feel' the bearing by grabbing the driveshaft and try to wiggle it up/down. Like when you check a U joint . You can jack it up and check all of these in a short time.
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Most of the Studebakers I have owned have a vibration at 35-40mph. No idea why (?) If you have a split driveshaft ,the center bearing mount could be in the wrong holes; the shop manual is not always right about this. Check it on a lift with weight on rear wheels; if it is crooked it will vibrate. Minors flaws in U-joints can be felt. I have a Rotunda gage to check out of round of driveshaft but a dial indicator could probably work. And front and rear driveshafts must be aligned properly, too. Very often they are not. Tail shaft bushings often need replacement and cause a vibration if worn. Good Luck!
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Originally posted by Jeffry Cassel View PostMost of the Studebakers I have owned have a vibration at 35-40mph. No idea why (?) If you have a split driveshaft ,the center bearing mount could be in the wrong holes; the shop manual is not always right about this. Check it on a lift with weight on rear wheels; if it is crooked it will vibrate. Minors flaws in U-joints can be felt. I have a Rotunda gage to check out of round of driveshaft but a dial indicator could probably work. And front and rear driveshafts must be aligned properly, too. Very often they are not. Tail shaft bushings often need replacement and cause a vibration if worn. Good Luck!
jack vinesPackardV8
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