shifting waaay to late

hey, i have a 95 camaro, with a 4l60e, and i got a guy to rebuild the trans with a shift kit, i got 4 10 rear end, and it shifts to late if im going like 50mph and i go to wot it just revs, like i think the shift points are way off or something if anyone can help me, it would be much appreciated

If it was not reprogrammed for the gears, it is not going to shift correctly.

hey shoebox yea i got it programmed for the gears, do you think maybe it is the shift kit? thanks