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Automatic Overdrive on 1994 Hyundai Elantra

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Car will not shift in to overdrive when button is pushed.
(1) Answer
You have a seal leaking that is making it so pressure doesn't get to the proper level. Thus, your transmission cannot engage overdrive. Recommendations: Just drive it without overdrive activated and use another car for long highway trips.