BTK_1986

hey all. so i recently swapped my 4.8 out for an lq9 and had my buddys tuner throw hp tuners on my truck. having a problem with the trans at WOT. right now the rev limiter is set to 6500 rpm and he had my shift points set at 6300. on the first run my truck was rev limiting before it would shift. so we dropped the shift points down and same thing. finally we ended up at about 5700 and it shifts intermittently now. sometimes it will shift when it should and other times it taps the rev limiter before it will shift. anyone every expierienced this. i am very confident in the tune and tuner as i have personally driven and seen cars he has built and tuned. he is also confused with this.