Well, your explanation is quite complicated, but I understand that it has to do with the times, a recurring problem in the reverse of the automatic transmission of the Ranger and other Ford models with the same box and for those years, I think I understand when you say that It kills, a term that is not adequate to simply say that the engine is stopped or stopped, because the driver is connected at the same time, the cause is by default the solenoid valve corresponding to the reverse that releases pressure at the two gears, forces are contacted and become a brake for the rotation of the engine. You will have to turn to a transmission specialist.