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Do you know if the fluid is full for sure? Does it work in reverse at all? If you manually shift if from Low to drive will it move forward up to speed?
If the shifter is not moving the shift mechanism it will go into reverse. But typically if it gets to drive and drive works normally than it has to go past reverse to get to drive. At that point I wouldn't think that it is a shift cable however click the illustration I have attached this shows the lever directly below the air intake. You will have to remove the plastic intake scoop covers to get to the shift cable the red line indicates the direction of the shift cable it wraps over the top of the transmission and up to the firewall. If the shift cable is moving normally the problem is in the transmission if the fluid is full and you still have no reverse this is strictly a mechanical/hydraulic connection.