1987 Camaro, retrofitted 1992 LB9, 700R4. Recently replaced the transmission with a rebuilt 700R4 from a good shop. I did this to correct the wide open shift issue that I was having. Under WOT the transmission would not shift from 2-3, either manually or leaving the shifter in the Drive or overdrive under WOT, I would need to back off WOT just a little and it will shift fine. I am pretty frustrated right now. Second guessing my purchase, maybe I should have replaced this with a 400?

What area should I start to investigate, as now I have two transmissions that both seem to have the 2-3 WOT shift issue.

Thanks to all that reply.