Ok i have 80 berlinetta with a 350 5.7 and a A/T th350 trany when i first got the car it would slip in and out of gear, so i completely rebuild this thing now it rides fine in first gear but it wont shift into the other gears sometimes if i hit the gas real hard or take the RPM's real high it might i replaced the vacuum reg and filter. i dont know what else to check any ideas would be great thank you.