Help vibrations
 

I am having a big problem with vibrations, I think it comes from the driveshaft or something in this area. I have tried the following.
Pinion angel set up and down are now at front 2 degree down, rear axel 2.5 degree down and driveshaft 1 degree down rear.
The driveshaft has been fully balanced and is straight and with new u-joint. I have tried two different complete rearaksel carrier.
The vibration is coming at around 4000 RPM in high gear (TH700 with lock up) and getting worse when I goes higher in RPM. The rear is 3,89-1. and the car is a 69 Camaro take a look at http://www.pro-touring.dk

Thanks Peter
:(

You have already discovered your problem....the pinion and powertrain cannot both angle down. If the powertrain is set to 2.5* down than the pinion has to be at least 2* up. That will take care of your condition.

BTW, see this thread...we just had this discussion a week ago.

Hi Denny

Thanks for your answer, but there are somthing that I dont understand, I have bought a book How to build & modify GM Pro-touring Street machines. In this book there are pictures and explanation these word are from this book
Engine and transmission tilted 3 degrees down, pinion angel is equal to transmission angel 3 degrees down. Notice the pinion and transmission angel are both down.
Please explain because now I am confused!

Thanks, Peter
:_paranoid

Peter, the angle of the pinion vs. the angle of the trans output shaft should be equal, but opposite; meaning they both have the same angle, but the pinion is pointed up and the output shaft is pointed down.

Don't be confused Peter, if you saw in print that the pinion and trans should both point down it was obviously a typo. I have spoken with Tony several times, he is a pretty bright guy. He is currently working a new "version" of the book to correct some typos from publishing.

Reset your pinion to point up a few degress and you vibration will go away.

Hi there,

Now I am getting it, I will try to put wedges between my rear end the spring to get the angel up.
I will be back soon with the result.

Thanks for the advice.

Peter.
;)

I have now put my pinion angle to the following specifications: Trans output 2 degrees down, drive shaft 1 degree up, and rear end 2 degrees up. In this way I will have 3 degrees working angle front and 3 degrees working angle back and they are opposite.
But…….. The vibrations are still there. I feel no difference it is still like the vibrations is coming from the drive shaft or the u-joint.
Any other suggestions to this problem, I will do anything to get these vibrations away.

Peter
:willy: :thmbsdwn:

You sure it's not a tire out of balance?

Actually your working angles are 1* at each end of the shaft, driveline angles look good. If you still have a vibration I would look at u-joints themselves (even if they feel good) or wheel/tire problem(don't take it to Wal-mart, you need to find a "good" tire center).

Yes!!!!!! Now the problem is solved, after I got the angle right and the vibrations still was there I try replacing the bearing in the extensions housing and the front u-joint this solved the problem.
So the wrong drive shaft angle must have destroyed the bearing and the front U-joint.
Thanks for the help and god explanations, if any of you guys ever come to Denmark, Europe then come and visit me for a cold beer.

Thanks Peter
:thumbsup: