weird vibration at speed 60 plus

[Keith Seymore]

Originally Posted by 75chev4x4

Maybe a little. Went to the yard and got my original gm drum and put that on. Went out and drive her and it made the vinration change. Now it feels like 1 vibration instead of two, so maybe the drum was making one. Also I was reading about clocking the driveshaft to the dif and transfer case. I unbolted the ds and rotated it 180 degrees rebolted ut up and now the vibration doesnt start until darn near 70. My plan today is to rotate the transfer case end and see if this helps. The yard was scarce on 4x4 trucks so no luck finding a new ds yet. Ill play with it today and if nothing ill take it to the ds shop.

Sounds good. If the vibration is changing then that means you are touching the right components (and having an effect).

Keep doing what you are doing.

K