Vibrating drive shaft

[Gabe]

After my rear-tire re-balance my vibes seem to have gone up to right around 100 and they're lessened. It feels better, but I still haven't had the time to run down to Mexico for a 110-120 run

 

[Doc013]

YES...fixed it!

Today was driveshaft clocking day. The first 90d made it worse, so we knew we were on the right track, cause it made a difference. The second 90d turn fixed the vibe. Smooth as cake. Took it up to 125 w/o issue.
So glad we have these forums, and thanks to the OP's before me!

 

[sloppymax]

I have people referencing changing the clock on both ends of the ds. Which end were you adjusting?

 

[Gabe]

Yeah, what he ^^ asked.

Were you adjusting just the front of the shaft or the rear ?

And did you do it on a lift or in your driveway ?

 

[fdjizm]

Today was driveshaft clocking day. The first 90d made it worse, so we knew we were on the right track, cause it made a difference. The second 90d turn fixed the vibe. Smooth as cake. Took it up to 125 w/o issue.
So glad we have these forums, and thanks to the OP's before me!

Which end did you change, I have yet to try clocking.

 

[lindertw]

my DSS 1pc (aluminum) was sent back for inspection - had vibration at several speeds after install. Measurement was at max of 3-3/4" after install, and adjusting UCA/pinion angle would not decrease that measurement. Tech I spoke with today said it might be a bad CV joint.

hope to hear back from them soon...

edited to add:

Today was driveshaft clocking day. The first 90d made it worse, so we knew we were on the right track, cause it made a difference. The second 90d turn fixed the vibe. Smooth as cake. Took it up to 125 w/o issue.
So glad we have these forums, and thanks to the OP's before me!

Which end did you change, I have yet to try clocking.

also interested to know if you only loosened the front bolts and clocked/rotated it? That would certainly make it a bit easier!

 

[skwerl]

When I swapped in my new T56 transmission with the new Dynotech driveshaft, I had a really bad vibration from about 70mph and up. The vendor's first response was to have me send the driveshaft back to get checked and it checked out fine. I decided to go get all my tires balanced again (they are less than a year old) and one of my tires was bad. Got the tire replaced and now 90% of my vibration issues are gone.

Just throwing this out there as a suggestion for you guys to eliminate the easily verified possible sources of vibration first.

 

[fdjizm]

^I was able to move my vibe to 95mph from 80mph adjusting the pinion angle but that's about ut, this was happening with my last set of tires as well.
I had the car up on rear jacks and the vibes starts real heavy at 100mph I want to try clocking just the pinion in the rear because it looks heavy compared to the trans flange. I'm thinking he stuck to messing with the rear pinion that would be the easiest route.

 

[GrabberBlue5.0]

When I clocked my driveshaft I clocked the end attached to the transmission and that greatly affected the vibration. I also need to adjust my uca to slightly shorten the length of my CV joint, hopefully I will get around to fixing this issue for good by tomorrow

 

[travelers]

I have the driveshaft that american muscle sells sitting in a box still waiting to go on. I currently have zero vibration issues so kinda fear using it ha

Who makes there DS?

 

[Rob72]

The more that I read the more I think that the carbon fiber DSS may be a better option. It's also a 1/4" shorter in diameter.

 

[D98GT]

Who makes there DS?

I just went and opened the box; axle exchange

 

[Scuba-Matt]

You need to check your pinion angle after a drive shaft install. A Pinion angle out of specs will cause a vibration.

 

[Doc013]

I changed the back as in Mr. Anderson's photo, and as recommended to him by Shaftmasters. We did it on a lift, and it took about an hour for the two 90d moves, and test drives. I'll never be over 700hp in this car, so saw no reason to spend more. Happy with my Shaftmasters DS.

My car just had new rims, tires, camber bolts, lca's, panhard installed. All was properly double checked, and then a REAL alignment done as well before clocking. The back end, and the front were both off!

Stang is an Auto. My pinion angle was never changed from stock with this install....jfyi

 

[fdjizm]

^figured it was the rear, going to put some work in under the car this weekend and clock away!

 

[fdjizm]

Well clocked my driveshaft today from the rear pinion, all 4 positions.
Still vibe! what the hell could it be? Had the car on jacks and spun the rear wheels to 100mph after each position change.. feels like its riding on rumble strips after 90.

So not the driveshaft, not the pinion angle, not the tires/wheels because I moved the fronts to the backs and tried again. can anything in the diff cause this?

 

[white05gt]

Well clocked my driveshaft today from the rear pinion, all 4 positions.
Still vibe! what the hell could it be? Had the car on jacks and spun the rear wheels to 100mph after each position change.. feels like its riding on rumble strips after 90.

So not the driveshaft, not the pinion angle, not the tires/wheels because I moved the fronts to the backs and tried again. can anything in the diff cause this?

Have you had the driveshaft checked to make sure it is balanced by a local shop?

 

[GrabberBlue5.0]

Well clocked my driveshaft today from the rear pinion, all 4 positions.
Still vibe! what the hell could it be? Had the car on jacks and spun the rear wheels to 100mph after each position change.. feels like its riding on rumble strips after 90.

So not the driveshaft, not the pinion angle, not the tires/wheels because I moved the fronts to the backs and tried again. can anything in the diff cause this?

An out of balance driveshaft can easily cause this

 

[fdjizm]

The car does the same thing with the OEM drive shaft. That's why I say its not the drive shaft, stumped.

 

[Napoleon85]

The car does the same thing with the OEM drive shaft. That's why I say its not the drive shaft, stumped.

Bent axles?