In Reply to: Play? posted by mikeS on June 28, 2001 at 10:55:13:
THe flat spot I'm feeling is this: when I pivot the ujoint starting at one end of motion and begin the sweep to the other end, at the midpoint, the ujoint sorta encounters a spot where the motion is not fluid, and the motion will stop and just rest at that midpoint. If I add a wee bit more pressure to continue with the rotation, it feels like it first rides over a little stiction and then rotates freely to the other end. Rotating back to the origin point, I encounter the midpoint stickiness.
It's not at all binding tightly to the point that I have to push hard with the palm of my hand to move the ujoint. But it doesn't freely rotate under the influence of gravity at the midpoint either. It just sticks there.
The big thing to watch out for is excess play. The joint should be smooth but tight (ahem!), with zero axial play at all normal angles. As soon as play comes into it, the joint deteriorates rapidly.
I feel no axial play at normal angles. I don't feel any excessive play either and it doesn't slide colinearly either. Other than that slight stick, and a little grease marks around the ujoint seal, I wouldn't mind using the old driveshaft if not for that stick...