It should shift at wot at 4.500 or above, depending on what the car is. Different model and year cars have different governors in the tail shaft that control the max rpm it will allow it to shift at with the TV cable set at the max setting. The Thunderbirds and Mark VII had the lowest one, around 4500 rpms, while certain Mustangs had ones that would allow 5000+ rpm shifts. With the car fully warmed up, in OD position and normal gears, it should shift into OD at light throttle around 40-45 MPH. If it is shifting before that, it confirms the TV cable needs to be slightly tighter. It is much better to have it slightly tight than a little loose.