Umm... That's a load of crap. Ever cracked a detroit open? Do you have ANY clue whats in there???
Detroits make noise. I've owned 6 of them in axles ranging from Dana 30, 44, 60, and 9"s. They ALL clunk and pop every now and again. They are ultra simple, with a pair of side gears, a pair of springs, a pair of clutchs and a spider gear assembly. That's it. There's no adjustment possible, other than perhaps replacing a worn out spring.
The REASON that they make noise is that their resting position is locked. Especially in low speed, high traction manuevers, ie... parking lots and u turns, the locker must disengage and the outer tire must turn much faster than the inner. That's the rachetting you hear during the manuever. After your turn, if you get a pop, its because the locker relocked before the axle shafts were 100% in phase. It pops out, then relocks.
The performance you are noting is 100% normal.