The Nissan Path

i had the radiator issue with my 2007. i replaced radiator, lines, cooler and put in a used transmission. the pathfinder will not start. replaced battery and starter and nothing changed. not sure what to do next. this has been very agravating. any suggessions would be greatly appreciated

There have been some failures of the PNP switch on these transmissions, which is part of the valve body. Perhaps you got one with a bad switch. Best thing to do would be to download a factory service manual and follow the diagnostic steps for a no start condition.