I would have to say that is not a transmission issue.... Most likely a misfire etc, because it should have revved out to 5500 rpms and about 40mph in first gear when flooring it. If it never gets to 5500 it wont try to shift, and it wont make "slipping trans misfires noise".
ok, so how can i detect said misfire if thats the case? would a scanner help out? or it wont throw codes without dummy lights going off?
2001 Grand Prix GT - stock (for now )
2007 Trailblazer SS - back under the knife , motor #4 on the way