727 Shifts Down to 2nd at highway speeds

Tech857 said
Austin you appear to have an adapter but your stud is in the wrong hole. Trans fluid on a mopar like yours is checked idling in neutral.

I will check the trans fluid today after work

Tech857 said
Austin did it seem to shift and hold before the fluid change?

It was doing the same thing before the fluid change.

Tech857 said
How far are you into the throttle when it kicks down? After 60mph or so mine stays in 3rd even at wot. My car has 3.55 gears.

I am barely pressing the peddle and it will shift down. Not sure what the gearing is but I know it has 7 1/4 rear end