I have vibration issue in 2003 tacoma double cab with 184000 miles 4 wheel drive with trd,while accelerating. When I let off the gas vibration goes away as soon as I get back on the gas it rattles my whole dash. All u-joints are tight. When i lift both rear wheels and spin tires I can hear the clunk and wheel has some play passenger side is worse than driverside. Also with wheels up engine on and in gear i can see the wheels wobble around 80 mph. Is this symptoms of axle bearings or something in the rear diff ?

 

Could be the bearings in the rear axle are shot after so many miles. Time for a rebuild. I bet you have a pinion gear wobble too? Maybe with an oil leak? I bet no one ever changed the gear oil in all this time. Could be nothing more than normal wear and its time has come.

And I bet the u-joints are shot too you just cannot see them moving around. Mine lasted a little over 200k so yours cannot be far behind.

 

I ll bet you are right about time for a rebuild. i did change rear diff oil about 50,000 miles ago. I guess i will drop drive saft out and check u joints and change pinion gear while i am at it!!! Thaks again for reply.