Need Help with low speed Vibration/rumble

I have a 08 double cab TRD sport 4X4 no lift with approx 82k. I am getting a low speed vibration especially while cornering, by low speed I me less than 5mph my best guess is around 3mph. I can make it do it by doing tight turns in a parking lot, it is enough of a vibration that you can feel it in the seat and if there is any thing in the bed it'll rumble. I am also getting a vibration at 15mph which I know that there is a TSB out for. I'm not as concerned about that as it is not very noticable unless your looking for it. I have been doing my research and have tried most everything, to no avail. Here is what I have done.
-Changed gear lube, running

$30 Mobil 1 75W90 Mobil 1 104361 75W-90 Synthetic Gear Lube - 1 Quart (Pack of 2)

Mobil 1 75W90 and Limited slip additive.
-Rebuilt drive shaft (3 u-joints & carrier bearing).
- Drove with rear shaft removed no vibration!
Any Ideas or help would be very much appreciated.

 

maybe it could be the hub bearings?? or the tie rod ends i know i had some what of the same problem, it was a loose tie rod end the led to the bearing going bad. after a days work i had the bearing replaced an luckily the tie rod threads didnt strip out i just tightend it up. good luck with the problem though hope you get it figured out.

 

Did you ever have any luck with this?

 

I haven't noticed it since the weather has turned cold, but that could have to do with the roads being slick.