massive clunk/knock noise

[richl]

this is pissing me off, got a clunk in going forward or back wards at 5 mph and applying the brakes, its loud and you can feel it in the floorboard and it shifts the whole car with quite a audioable knock you can really feel it in the seat also !. dealer so far has replaced , both rear leaf springs, both the front and rear drive shafts and now with permission of gm the whole complete rear end unit....got a call yesterday from the service manager ,after they installed the rear end the problem is still there, dealer told me they are going to open a case Friday morning(tomorrow) and gm is having a engineer come out next week to figure out what is going on , my problems,

1/ its been 3 weeks , yea i got a loaner but its not mine hate the color too
2/ how many thousand of dollars have they thrown on it with no luck
3/ how long can they legally keep my hummer with out fixing it ???

and no i don't abuse it or massive off road it , the torsion arms were not adjusted,
its a 06 with 46k on her

wonder if they are going to give me a exchange vehicle for mine
thanks .. i have to vent over this