In diagnosing a vibration issue above 70mph, I have checked my pinion/transmission angles and they are spot on as far as having correct angles and diveline alignment.
I took the driveshaft off and began to play with the u-joints. The front transmission yoke joint moves very freely. It flops around and seems well lubricated. There is no play as far as twisting goes, but there is maybe 1mm of movement up/down on an axis of the u-joint. Could this be the cause of the vibration? Is the general rule of thumb, NO wiggle movement?
Also, the rear u-joint is almost feeling like it is seized up. I grab it and it takes a good amount of effort to get it to rotate on either axis. The grease inside is black and smells like someone took a crap in a bucket of hot tar.
I am replacing the rear for sure, but is the front suspect?
I took the driveshaft off and began to play with the u-joints. The front transmission yoke joint moves very freely. It flops around and seems well lubricated. There is no play as far as twisting goes, but there is maybe 1mm of movement up/down on an axis of the u-joint. Could this be the cause of the vibration? Is the general rule of thumb, NO wiggle movement?
Also, the rear u-joint is almost feeling like it is seized up. I grab it and it takes a good amount of effort to get it to rotate on either axis. The grease inside is black and smells like someone took a crap in a bucket of hot tar.
I am replacing the rear for sure, but is the front suspect?