Vibrations come and go.
 

Ok, so the problem Im having with my blazer is that the car begins vibrated when I reach 20km/h. At this speed the car starts to shake. This started happening randomly. The strangest thing is that it comes and goes. I also hear a pop sometimes when I turn combing from the back.

Thanks for any help.

Check the universals on your drive shaft for the pop. It could also lead to some vibration.

+1
That popping could be bad u-joints on the drive shaft.
A kid I know did that the other day on his 96 Blazer, and no mo' poppin'.

Thanks for the help, I replaced the u joint connecting to the rear differential and it fixed the problem.

Good Deal