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Q:

The transmission falls out of gear after 30ft. on 1991 Dodge D150

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Changed filter and gasket. changed vehicle speed sensor, still falls out of gear. Only has low when shut off and re-started.
(1) Answer
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Unfortunately sounds like a transmission problem. You will need to go to a transmission shop that hopefully has experience with Dodge products and may have seen this problem before.