I have a 1999 F250 super duty that blew a front seal on the transmission two weeks ago. I sent it to a shop and they replaced the seal, and torque converter. However when they put it back in it will not engage in drive or reverse. After working on it several days we replaced the transmission with another one from a service company. This replacement came with a 90 day warranty. However once it was installed it does the same thing and will not engage in drive, or reverse. I am not sure what is going on but with two doing the same thing it makes me thing maybe electrical or something else. any help is appreciated.

 

It isn't electrical. There is no electrical problem that could cause this. Something mechanical is wrong.

Is it a 4x4? If so the transfer case could be in neutral. Otherwise they did SOMETHING wrong.