My truck sounds like a school bus any ideas?

[84 400]

Well I have done some recent work to my 77 k10 and it sounds very loud going down the road. I can't feel any vibes tho so I guess that is a good thing? My father is sold that it is the font end but it is no longer turning... Plus it has new wheel bearings.

Recent work includes
New inner/ outter wheel bearings and races.
New super winch quarter turns
Parttime shaft kit in the np203
New front brake calipers

My front brakes are no longer dragging and the hubs are not getting hot which is great (old calipers) but the noise has me concerned. IT does have a 4 inch lift and 34 tsl bias ply swampers. I know Swampers are supposed to make noise and they do but this sounds more like a gear wine noise and less like tires.

The noise starts at sound 15 mph. Then quiets down but is till there.

Should i try lowering the T case with the factory spacers?
Any other ideas to help me diagnose the problem?

We took it on the high way for the first time on Saturday and it was very loud but no wobbles or vibes so that was good. I mounted the tires myself and they have not been ballenced.

Thanks for any help.