strange sound under the hood help

yea thats it, only when its under a load and in 6th and boost over 60#
 
are you both lifted 6 inches and if so did you use blocks or springs in the back? I've got a friend with a ford lifted 8 inches on 38s and he has the worst axle wrap I've ever seen and all he has is a juice with attitude. I would check and see if your binding up your u-joint at the rear end.
 
I did blocks and my buddy did springs but we both have traction bars to get rid of the axle rap
 
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