I have a 1997 ford f-250 automatic 7.3 DI e40d. After I drive my truck for about 30 min and it gets warm, then it keeps on getting hot and it spits out the transmission fluid by the dust cover at the front of the transmission

That is an extremely good and reliable transmission. They are very tough and easy to service. Assuming there's no real problem, I would drop and clean the transmission pan, change the filter, and refill with either Mobil 1 Synthetic Multi-Vehicle ATF or Amsoil Universal Synthetic ATF. Perform the procedure, in accordance with the link below:

https://www.askmehelpdesk.com/cars-t...ml#post1873132

You are likely experiencing a boilover, due to not changing the fluid and filter regularly. Ensure, also, that the supplemental transmission cooler is working properly. Synthetic ATF runs much cooler than conventional fluid. If this does not solve the problem, something is fundamentally wrong with the ATX.