drive shaft alignment problems

[captain69]

Lower 5 inches in rear eibach springs front eibach 2 inch springs 2 1/2 drop spindles

[Keith Seymore]

Originally Posted by davepl

But as for U-Joints, it is completely irrelevant how it looks (within reason). It does not matter what the angle is. What matters is that the angle is the EXACT same angle as the other end

Almost. It has to be the exact same angle but in the opposite direction. I hope/think this is what you meant.

The reason is because each time the u joint passes it maximum articulation it creates a disturbance. The rotation creates a disurbance that is sinusoidal in shape.

If the two u joints are at maximum articulation in the same direction then the amplitudes are additive (they double). If the joints are articulating in the opposite direction then the amplitudes cancel out and the net effect is zero.

I can't draw pics here but I will post the attached for reference. http://67-72chevytrucks.com/vboard/s...d.php?t=522180 Figure 4-20

Captain69 - you may want to peruse/memorize/become very familiar with the attached link.


K

[davepl]

Originally Posted by Keith Seymore

It has to be the exact same angle but in the opposite direction. I hope/think this is what you meant.

It is.

[captain69]

Originally Posted by Keith Seymore

Almost. It has to be the exact same angle but in the opposite direction. I hope/think this is what you meant.

The reason is because each time the u joint passes it maximum articulation it creates a disturbance. The rotation creates a disurbance that is sinusoidal in shape.

If the two u joints are at maximum articulation in the same direction then the amplitudes are additive (they double). If the joints are articulating in the opposite direction then the amplitudes cancel out and the net effect is zero.

I can't draw pics here but I will post the attached for reference. http://67-72chevytrucks.com/vboard/s...d.php?t=522180 Figure 4-20

Captain69 - you may want to peruse/memorize/become very familiar with the attached link.


K

Great article thank you.

[ItsRandy]

What was wrong with the stock cross member? I have a '69 C-10 which was a small block/TH350 truck w/low hump cab. It is now a BB 502 w/4L80E using the stock automatic cross member and I have plenty of room between the floor and trans.
I too think the trans yolk needs to be farther in the trans.

Oh...ya gotta' love Keith!