Rear axle vibration problem

OK so its been around 4 months that i replaced the right side rear shaft because it was bent, I replaced it with a used one, it was in good condition checked the teeth to see if it was OK, everything looked good.
I did the work myself, i replaced the two retainers and seal, re-used the bearing and put everything back in its place. Everything worked really well and mission accomplished. now 4 months later i start to feel a little vibration on the steering wheel going at a steady speed and only when i press on the gas, but when i let go of the gas the vibration will stop until i press it again. at first i thought it was my front end but after i investigated i found out it was the right side of the rear axle. I know its the right side because i lifted one side first and then the other side, both times put it on drive and stepped on the pedal, the left side was ok with no vibration but when i did it with the right side i felt the vibration. And sense the vibration has started I've feel that its getting worse. any ideas in what it could be??????? i want to get an idea first in what it could be or what it is, i really don't want to take it apart thinking is one thing and ending up being the total opposite. and wasting money in parts.

 

BUMP!!!

 

bump

 

bump

 

Does anybody know what im talking about ? bump

 

i thought it was my front end but it wasn't i raised the truck and i let the right wheel spin while the left wheel was still touching the ground and i felt the same vibration on the steering wheel. so i know its the right passenger rear, but i want to know what it could be causing the vibration ???

 

the rear again could be the shaft, bearing, axle casing itself, and the hub. why your feelign it in the wheel while stopped is beyond me.

Id also investigate the transmission mount and carrier bearing.

 

ya ill try replacing the bearing first and see if that fixes the problem if not im afraid its the gears inside the axle. but ya its only the right side that does that because the left side doesn't vibrate.

 

bump again

 

Fixed it and problem solved.......it was a u-joint that was making the hole truck vibrate like crazy