I have a vibration in my driveline somewhere. So far I have replaced the fan the harmonic balancer. Not sure of yokes and drive shaft? How could I continue finding the cause?

 

when did it start.

if you rev the engine in park and it vibrates, it is likely the engine or torque converter or bent flex plate or broken trans or motor mount.

if it only vibrates while you are driving, bad u joints, bent driveshaft or yoke, bent rim bubble in tire, bad driveline angles.
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Improperly aired up or clapped out tires can cause vibrations at highway speeds too. Check the low hanging fruit first.

 

i had a bad vibration on the highway for over 4 years. I could not figure out what it was. It ended up being the pinion shaft in the rear end. it gave out on me one day, i had it rebuilt and now there is no vibration.

just jeep looking. use all the ideas from above