tranny problem

[adam_murphy]

i just bought a 91 gst last night and it runs perfect! The only problem is the automatic tranny, it acts like its stuck in a high gear, does not down shift. When accelerating from a stop it acts like a slipping clutch slowly getting speed. I had the car doing 65 and it was still at 3-3500 rpms as thats where it engages from a stop. anyone know how to fix this? The tranny fluid is a nice clear red color and non burnt smelling also. thanks!
-Adam