My grandpa had an automatic in his 1986 4 cylinder and it would not stay in overdrive. I know that he was able to adjust a cable ( like a adjusting the clutch cable in manual) once it was adjusted it stayed in overdrive longer. Not as much kicking in and out. He has since had a 5 speed manual transmission put into it. He could not be happier. Mileage increased dramitically.
Nate
