Automatic transmission problem

I have problems with my automatic transmission, because when I place the lever in \ "d \" it takes almost 8 seconds to feel that the speed enters, I have changed the oil three times and the problem is not solved.
On one occasion he told me a mechanical \ "that had to drain the turbine oil too, but I do not know how to do it and I do not want to say, as long as it won $$$$$ and as I do the change, because I save that wool.
Help me !!! What failure will be !!!!

I forget to tell you that my truck is an Explorer4x4 Model 93 Automatic: blush:

Dear King, effectively in the torque converter is around 25 to 30 % of the oil, the issue is that in light vehicles it is not possible to drain it since it does not bring drain plug.
I have the impression that the mechanic is somewhat chanta, the problem may be in the hydraulic circuit, a decalibrated valve etc.

The problems with automatic boxes are vastative complicated to solve them, it is better to take it to a place where they know, now because of the failure that you say, the oil would have nothing to do whenever it is throwing the correct one, now these boxes have internal filters that are covered with dirt just like those of motor can be there, or it can also pass through the brake bands, but eye that these problems are difficult and difficult to handle