If unit has been neglected, my first thought is serves you right! Maintaining this stuff is essential.
That being said, change the fluid and filter. Use a container of Lucas transmission additive, along with the new oil. Do not expect a miracle. If it does help, change the fluid again in about two weeks. You don't have to drop pan if it has a drain plug when changing the second time. Put additive in on both changes! Likely you have a bad varnish buildup on the insides of the valve body.. you must be a really good tech to take one apart to clean it, so do not even think about it!!! Most shops do not advise changing fluid on neglected units but, if it already is malfunctioning you have everything to gain and nothing to loose at this point!
Good luck
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