2006 Tacoma 4 door 4 wheel drive. Squeak from rear end. Forward and in gear only. It will not do it in reverse or neutral. I put it in jack stands and turned wheels by hand and no noise. Everything points toward u joint. But why only in forward? Why only in gear? The drive shaft still spins in neutral when turning by hand

 

A squeak not a squeal like a tortured cat ??

Is it something when the suspension flexes

How much weight do you carry in the bed ??

Does it change with more or less weight