Q: dont know if my tranny is shifting into overdrive and the torch converter not locking in or the orther way around

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tranny shift fine when it hit 40 it sound like the tourch locks in and the over drive is not and it will not go over 50mph

My car has 258000 miles.
My car has an automatic transmission.

Gear selection, and coincident operating parameters (e.g., line pressure; solenoid position), on your transmission are easiest to see with a manufacturer scan tool. If and once it is determined that there is no lock-up, or no overdrive gear, the cause would be diagnosed using that scan tool. Note that some components such as a faulty vehicle speed sensor or faulty throttle position sensor can be implicated in a failure to shift scenario like yours. If you desire a diagnostic, the recommended service is a transmission shift diagnostic. If you request that service, the responding certified mechanic will get this taken care of for you. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

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