5.0 LX mustang tranny problem

[rlott42]

I have a 1988 LX 5.0 Mustang with about 350 horsepower that the tranny was recently rebuilt. I received the car back and when I tested it in Overdrive the tranny would take like 2 seconds to kick in after I floored the car. Also when I am doing like 80mph and floor the car the rpm's at about 85 mph are in the yellow. I basically cant go above 85 or 90 due to the fact the rpm's will be in the red. The reason I rebuilt the tranny in the first place was because in the car was not working in overdrive at all over 65mph, the rpm's would just race and the car would not go anywhere. What needs to be done? Does the overdrive have to be adjusted or the tranny rebuilt again? Does anyone know what the problem is?