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Old 06-04-2019, 09:24 AM
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Vibration issues

Ok just trying to see if my thinking is right here. So here goes use to have a very shaky steering wheel and was off some as far as not centered. Swapped front tires side to side, steering wheel is now centered doesnít pull one way or another now and the shake is gone. But Iíve been taking notice to a vibration at usually around 50 mph in the wheel and the seat, however as soon as I give more throttle up to 60 or more it goes away and smoothed out. The vibration when it happens is constant itís like it makes a revolution then stops then comes back. When my wife and kids are in the car vibration can be felt at around 45mph but will go away. Could it be the tires are just old and bad? It was sitting for awhile before I got it. Itís a 41 Chevy coupe 355 motor, 400 trans with 2800 stahl converter, 73 10 bolt rear with 3:42 gears just done about 3 months ago. Need some help. Oh and driveshaft does not have a counter weight on it but you can see it never did.

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Old 06-04-2019, 09:43 AM
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Tires out of balance will cause a vibration around the speed you're describing and then also goes away as you increase speed just as you describe.
I don't know how switching sides of front tires & wheels alone would change steering wheel being centered or not.
But switching them could change the feel of the vibration or shaking as you move the one with worse balance closer or farther from the steering linkage.

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Old 06-04-2019, 10:40 PM
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It doesn't take long for tires to flat spot from sitting and behave in a similar fashion. A broken or loose belt within the tire can do the same. This will usually show up on a balance machine as it won't clear on the second spin. Swapping the tires side to side and correcting a pull indicates there is a bit of an alignment issue going on that the tires have worn into. Tires out there now are date coded and definitely have a shelf life. Now matter how pretty and how few miles they can break down internally and catastrophically fail without warning. Riding around on out of balance tires also accelerates wear on the other steering components.

It's also a safety thing for you, your family your putting in the car , and those surrounding you should one decide to let loose. Get it checked out.

Last edited by Hipster_G; 06-04-2019 at 10:46 PM.
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Old 06-06-2019, 12:58 AM
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Steering wheel not centered is a mistake the person setting it up made, this is equalizing the tie rod adjustment to correct toe angle with the steering wheel on center, it is possible to get the toe correct with the steering wheel off center. Aside from feeling and looking weird when steated behind the wheel, the tires could still be pointed correctly. But this situation sounds like there's some issues present.

Bogie
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Old 06-09-2019, 02:06 AM
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Lets get the easy and cheap stuff out of the way.

Peek at your tires and see if you have a shiny part as a tell tell sign you threw a weight(s). Some tire places are better then others and they might leave the old adhesive on or just get the new adhesive greasy as they put them on.
I still don't 100% trust "stick on" weights and some gorilla tape goes a long way in keeping those stick on weights in place when your driving down a typical Michigan road.


So peek at those rims to see if you have any shiny bits.


Next up is your driveshaft.
Lets start with the u joints. They go out. It happens. Get the car up on jack stands and block the wheels then put the thing in neutral and rotate that drive shaft back and forth around 30 degrees. There should not be any clunking. Look at the rubber part of the u joint to see if you have any excessive grease around one of the caps indicating that the seal has gone and the thing is probably full of water/rust or just dry.

Move back to the pinion and go up/down and side/side checking for play in the bearing. Do the same thing at the rear of the transmission(or transfer case) output.
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Old 06-09-2019, 05:01 AM
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Cerial did check all tires nothing shined anywhere, actually already changed the universals, and the rear gears and all were just changed. Rechecked everything again last night with some help, rear looks fine backlash was set a little on the tight side but that’s all fine. It’s looking like the exhaust is being my culprit. The tips are almost touching the pinch weld and the pipe itself is almost touching a bolt for leaf spring bracket with nobody in the car, sat in the car and had my buddy tap on the tips for the exhaust and it is the same thing I feel in the seat going down the road. So got some bending to do today and see if that solves it. Thanks everybody.
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Old 06-09-2019, 06:45 AM
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by chance are u running a drop axle ??

i ask because this is right at the sweet spot of steering wheel vib u can get on the model T and A with a drop.. it needs a slight toe in. but if u are running A arms then forget that one..
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Old 06-09-2019, 08:04 AM
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Put new tires all around on it, have the alignment checked and I bet it feels like a new car.
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Old 06-09-2019, 08:08 PM
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Does it vibrate when your off the throttle?
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Old 06-10-2019, 02:42 AM
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No it doesn't.
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Old 06-10-2019, 01:38 PM
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Check your steering linkage, shocks, struts, sway bar(s), leaf spring bushings, and shackles, for play both with the car on the ground and when you have jackstands under the frame.
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Old 06-10-2019, 04:10 PM
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the rhythmic vibration around 50mph that cycles about every 1-2 seconds is the classic driveshaft vibration. Sometimes some angle correction can help but often requires having the driveshaft balanced.
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