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Q:

no overdrive. all other drives work. on 1990 Lincoln Town Car

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
on overdrive what so ever engine just revs. all the other drives work fine
(1) Answer
It is possible that you will only need a sensor such as TCC. How ever it sounds more like the clutches, or other internal problem. We would only be able to guess here without checking it out. I believe you are going to have to take it in for diag. and repair.