Guys, I have had this issue for a long time but I think i finally found the source of of my vibration. The problem has been that around 80mph, i get some sort of vibration from the drive line of the car. In the process of trouble shooting, i have checked the runout and balance of everything and never found anything wrong. I have also tried 3 different drive shafts with no difference between any of them.
But one thing i overlooked was the angle the transmission was on. I found that my trans is on a 4.5° angle and the pinion was at 0°. I now know that both the trans and the pinion have to be on the same angle. But when I do this, my drive shaft runs at a 4° angle out of the pinion and this causes even more vibration. The recommended pinon angle is no more than 2°.
I am pretty confident that these angles are what have been causing the vibration. But, there doesn't seem to be away to fix this. With the car riding so low, I dont think its possible to to have the trans and pinion angles parallel without running the drive shaft at a 4° angle. This is even after i shimmed the rear of the trans as high as I can, its almost hitting the tunnel now.
The other thing is that I'm surprised of is that I seem to be the only one with this issue. Is this really that uncommon? Has anyone else had this issue?
But one thing i overlooked was the angle the transmission was on. I found that my trans is on a 4.5° angle and the pinion was at 0°. I now know that both the trans and the pinion have to be on the same angle. But when I do this, my drive shaft runs at a 4° angle out of the pinion and this causes even more vibration. The recommended pinon angle is no more than 2°.
I am pretty confident that these angles are what have been causing the vibration. But, there doesn't seem to be away to fix this. With the car riding so low, I dont think its possible to to have the trans and pinion angles parallel without running the drive shaft at a 4° angle. This is even after i shimmed the rear of the trans as high as I can, its almost hitting the tunnel now.
The other thing is that I'm surprised of is that I seem to be the only one with this issue. Is this really that uncommon? Has anyone else had this issue?