Truck has vibration,Rear wheels jacked off up off ground,transmission in park,wheels still turn,driveshaft doesnt.

It's really pretty simple. Jack the truck up and rest it on jackstands on the frame of the truck. Remove the wheels, brake calipers "if it's disc brakes drums if it's drum brakes" remove the brake cable from the park brake assembly, remove the brake fluid lines from the wheel cylinders if it's drum brakes, remove the bolts holding the driveshaft to the rear yoke, remove the bolts holding the rear end to the leaf springs while the rear end is supported with the jack and then slowly let the jack down.... It's out!

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U joints get worse as speed increases. You can try replacing the mount for the transmission it may help. Also check to see if the drive shaft is damaged.

drive shaft might of snapped or your u joints on the shaft

You will need to check things logically. Run the truck in the air and note where the vibration is at. Take the wheels OFF and put a few lug nuts to hold the rotors on, take the truck to 45mph or whatever the vibration is the worst. is it still there? if its gone, check wheels/ tires. if its still there, check rotors, axles. A drive shaft will make a rapid vibration at low speeds since it turns 3 to 4 times faster than the wheels. does it vibrate on or off the gas? Can you power through the vibration like go 60 and then coast back through? You have replaced a lot of parts that would not cause vibrations. Are you just changing parts willy nilly or is someone actually checking and verifying that these parts really bad?

drive shaft might be bent? have it check and balanced.

The truck is in park, this means the parking pawl is engaged to keep the wheels
from moving and it locks the transmission/ driveshaft. Try putting it in neutral instead.

The drive shaft yoke is dry on the transmission out put shaft. When you stopp it slides in on the shaft, and then when you let go of the brakes the yoke sides back and goes clunk. Remove drive shaft and lubricate the splines in the yoke.

Hi, well with both wheels off ground, they will turn opposite directions when you turn one of the wheels even in park. now if engine is running and you put it into gear and the driveshaft turns but not the wheels, then someone stole the guts out of your rear end.

Your rear emergency brakes could be hung up. Especially if a parking valet or someone else parked it recently.

You need to jack up both rear wheels and then put your car into neutral with the motor OFF. If the rear wheels can not be manually turned it is either the emergency brakes, the differential or the transmission.

The emergency brakes require removing the back tires and rotors. If it is still locked, then it is either the differential or the trans. The driveshaft connects the trans to the differential so remove the driveshaft. If the differential turns without the driveshaft, then the trans is locked up. If the differential does not turn the problem is inside the differential.

The rear end and the transmission are possible to blame. The rear end jacked up and on jack stands with both or all wheels off the ground . $ wheel drive needs all wheels to be up on alevel hard surface in a quite place. With a driver in the truck driving at the speed the noise is loudest listen to each partt with a broom handle pipe Ect. the rear ends are most likly and the noise changes from slowdown or speedup. Lack of lubercanrt would be nice or jast a bad wheel bearing ( grab the stopped wheel and try to move it up and down ) No play should be found and turn smooth, in and out a little is normal and the brakes on or off shouldn't changany thing or they are suspect. Driveshafts click pops and ring not wine. Trannys get bad bearings if they do you may have noticed other trans related problems as well. When trannys whine they do bad things are are getting ready to. Somr driveshafts have a carrier bearing are two piece and have a U joint in the middle. Listen to the sounding rod while running touched to this part and it will be a for sure if its bad