Rear axle whine/howl at 25mph and up

I have a 1" block lift rear installed over 10,000km.
24000km on truck.
persists in any speed above 25mph under accel, decel, neutral, 4wd and 2wd.
sound does not change with engine speed (i tried it in 2nd, third and fourth)
tyres are TKOs

annoying.
thoughts?

 

Block has nothing to do with the sound. You prob have a bearing going out, isolate the sound to a side and go to work.

 

Seen. Just giving an idea if someone thought it may have to do with the driveline angle.

 

That's it right there. Edit: A body lift doesn't affect you suspension geometry just how high off the frame the body sits.

 

do this....... lift up one side and put it on drive and let one of the rear tires spin in the air, hear for something, if you cant hear nothing try the other side.
I had a vibration problem and it also hummed until i found out it was my u-joint, small things are really noticeable and the most annoying ones because you imagine it to be a huge problem.

 

Id rather let the dealer do this at next oil change (first 6 free) since its under warranty but fear they will dismiss it due to modification.

 

You are ballzy, I do the same thing but use the shops lift with both wheels up.

 

it can be done like that to but sense the two wheels are up one is going to spin faster then the other one and you wont know if its the left or right wheel, baring, or shaft.