It is going in gear just will not pull.

So, we need to double check the fluid level and make sure it is full and clean. If not, service it first and foremost.

https://www.2carpros.com/articles/how-to-service-an-automatic-transmission

If the fluid is fine, then we need to check the pressure on the unit.

I am attaching the process for each of the possible units. The first is the AX4S. The second is for the 4F50N.

Basically, this will prove out what I suspect happened which is the pump has either failed or there is a seal in the front of the pump that has pushed out and you lost all pressure.

This unit is known for failing transmission pumps, so we need to check the pressure and go from there. Thanks