89 4 speeed auto overdrive proble help plz

1989 mustang 4 speed automatic overdrive wont go in you can feel it still there but if u push on the gas i just got to drive any help on it. i know its there because you can drive down the road at 55 and let off the gas and put it form drive to over drive and the rpm change a lot drive runs at 3000 at 55 and over drive runs at1800rmp at 55 so any one have any clue on it thanks for ur time:runaround:

is the linkage hooked up on the throttle body if so you may need 2 adjust it

is the linkage hooked up on the throttle body if so you may need 2 adjust it
thanks ill look and see if it is i know its hooked up but adjusting it might help