Ford Explorer has no strength in transmission

Ford Explorer 93 Automatic Automatic, VAT Running and when trying to regret another car to accelerate quickly to respond and as it was felt that something was saved or broken in the enacerador (like the chicote). Now my truck does not run to more than 5K/h. The engine works well (it revolutionizes perfectly and with great force) the reverge enters and runs at the same speed, it feels when the speeds enter when moving the lever as if it were going to normal. Thanks in advance

Good night, if the truck is automatic, check the envelope guaya if it is broken.

Greetings If the truck is 4x4 and you feel that the box enters the speeds, the transfer must