I have a vibration that started to get a lot worse last week. I have always have a slight vibration at around 30 MPH but not like what it going on now. It’s only present when you accelerate and are between 25-45 MPH. I have greasable u-joint but not sure when the previous owner replaced them. I just chased away the three amigos and believe that my hubs are in good shape. I don’t want to just through money at it but know that I need to do something. I read that you can’t really inspect the front driveshaft. What should I do?

1) Have front driveshaft rebuilt?
2) I never hear anyone talk about the rear driveshaft. Should I also have the rear rebuilt?
3) Should I replace the rotoflex joint?
4) Tires look like they are wearing correctly. They have about 10K miles. Not thinking it’s the tires because the vibration only appears when accelerating.
5) I have a new, last 5K miles, steering stabilized.


2000 DII, 98,000 miles

 

There are many factors that can contribute to a vibration. Is the vibration on the steering wheel, the whole car or....?

1.) You said you have just one greasable u joint in the front? Than definitely have your front drive shaft rebuilt or better yet replace it with Tom Woods.

2/3.) The rear drive shaft has no problem. Replace the rotoflex if you see any cracks. Also, there is one grease fitting that should be greased every oil change.

4.) Tires may need balancing. Are they factory recommend PSI air pressure?

Another factor could be worn/warped brake rotors. Are you getting some sort of pulsating when you brake?

 

Go have your tires rotated and ballanced, check their air pressure and grease all your u-joints,have you looked at your rotoflex to see if there are cracks between the 6 bolts, then if it is still there, get back to us.
If you want to verify if it is the front shaft, remove it and manually go in and engage your CDL so you can drive on the rear shaft only, see what happens.

 

The vibration is on the whole car. There are 2 grease fitting on the forward end of the front drive shaft. I’ve not seen a fitting on the rear dive shaft, so it’s not been greased for the last 12K miles. I run the recommend pressure in the tire and check it monthly. I didn’t see any crack is the rotoflex joint about 6 months ago. I’ll have to check it out when I get under it to remove the drive shafts. Thanks for the input.

 

Exactly how many grease fittings are on the front shaft, should be 3 plus a plug? The u-joints need to be greased with every other oil change.
I don't care what the rotoflez looked like 6 months ago, what does it look like today?