im thinking its the driveshaft. i rotated the tires to make sure one didn't throw a weight. changed the rear diff. there were large broken pieces of the ring and pinion on the drain plug. bearings are good. and drive axels seem good. would a bushing cause a vibration at speed? and has anyone ever gotten their driveshaft balanced? everywhere i call says they can't do it the "u" joints can't be replaced.
help would be greatly appreciated.

 

ay ideas, any at all?

 

I had, and still do sometimes, this problem as well. Still not sure what it is yet.

 

The U-joints can't be replaced on the factory driveshaft - this is correct. If you suspect the driveshaft, get an aftermarket one. Most of them have replaceable u-joints.

-=Russ=-

 

thanks russ where can i find one of the after market types?

 

I know you can get one from www.mazdatrix.com.