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My 93 has been having a vibration, but it's only when I'm accelerating. Once I let off the pedal, it stops. I was under the assumption that it was a U-joint going, but all three of them are still tight. I'm curious to know if it could be the carrier bearing, that is making the vibration. The only play I have in the rear driveline is in the carrier bearing itself. If I move it up and down, I can hear a rubbery sloshing sound.
I figured it was a U-joint, but I checked all three of them. Tight as can be... Carrier bearing was the only thing with what I consider abnormal play in it.
Could be tail shaft bearing or pinion bearing, carrier would be my last thought as it is made to flex some and unless severely deteriorated, should last for darn near ever. My 84 is still original and looks good so far. Good luck!