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Discussion Starter #1
So whenever I approach 60 mph I can start to feel a slight vibration in the floor and by the time I reach 80 mph, its much worse and loud also. Not gonna go faster for fear of proper f*%#ing it! I'm guessing drive shaft issue? Haven't check tires balance yet, but I've ridden in vehicles with shotty tire balance and this doesn't feel like it, this is a higher frequency.
Car is a 68 Camaro with a 383 stroker, auto 700AR tranny and original diff. Also have a lowered and stiffened suspension.



Do performance shops have some sort of dyno we can run the car on and measure the vibe frequency to isolate what is causing it?
 

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Had a similar issue with my 68 it ended up being the rear end yoke. It would go away when I was on the gas hard buy while just cruising would have a vibration.
 

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Did it start when you lowered it? If yes then most likely driveline angles as Al said.

Don
 

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I had a vibration at 70 MPH way back when I could drive my Camaro. I balanced the tires here on the car and replaced u-joints before a 700 mile trip to Oklahoma. Had the tires rebalanced down there off the car and still had the vibration. two or three people looked at the tires for broken belts and found nothing. I finally bought new tires and fixed the vibration.

Jeff
 

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Car is a 68 Camaro with a 383 stroker, auto 700AR tranny and original diff. Also have a lowered and stiffened suspension.
As noted, assuming your tires are balanced, this sounds like a DL angle problem.700R4 would have a different X member/location and possible different angle

Certainly bad U joints can do this but yours sounds more like a DL angle problem. You can measure yourself using a magnetic angle finder and do the math. The car needs to be on all 4 tires to do this or take it to a drive line shop with a drive on lift so they cam measure your DL angle. Usually shimming the trans can correct those or angle shims under the rear end housing.

When I lowered my car 2" I needed 2 degree shims in the rear. Got them from Speedway
 

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I would check the dL as well. When I put the new suspension in my 67 I had to correct the angle. I downloaded the TREMEC app to my phone and used it to set it properly. I5 worked great
 

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Had very similar issue on my 69 camaro. Ended up replacing differential yoke. Slight play between u-joint caps when installed in yoke. New yoke, vibration solved.
 

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I had a bent axle. The only way we figured this out was when we tried to surface the disk brake rotor. But DL changes, driveshaft and yoke could also be culprits. Check them all.
 

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I put mine on jack stands, using my hands to rotate the tires on the rear,I moved them forward and back in quick motions and noticed the clunking of the joint at the rear yolk, also noticed a little play in the shaft, had it rebalanced with new style larger joints and poof, all good.
 

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Discussion Starter #14
Ok guys, I finally had the chance to have my wheels road force balanced, they needed minor tweaks but all in all, they were pretty close. Either way they're bang on now and the vibration is still there. So drive line issue it is! Before I start disassembling things, does anyone know what the angles are supposed to be at specific locations and where exactly to take the measurement? I have a digital protractor, just need to know the specs......

Cheers,
 

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Ok guys, I finally had the chance to have my wheels road force balanced, they needed minor tweaks but all in all, they were pretty close. Either way they're bang on now and the vibration is still there. So drive line issue it is! Before I start disassembling things, does anyone know what the angles are supposed to be at specific locations and where exactly to take the measurement? I have a digital protractor, just need to know the specs......

Cheers,
There’s an app for that :grin2:

https://www.tremec.com/menu/tremec-toolbox-app/

Don
 

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Discussion Starter #18
Christian, I am real curious as to what number (it's in lbs) did the road force balance show?
What tires and size are you running? Hopefully they gave you the numbers. Thanks
Crap! They did but I didn't take a copy. I'll ask if he can send it to me. I'm running 17" wheels
 

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The Tremec app is very handy and I'd agree giving it a try. There are a number of sources available online discussing DL angle tolerances. I've found the article attached below to be helpful in understanding how to best measure these angles. I had vibration issues that was only solved with a properly made driveshaft balanced at high speed. If you're running a 4.10 or higher gear you can easily get vibration at freeway speeds if the DS is not spot on and most DS shops don't balance shafts properly for very high DS speeds.
 

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