can i put a 1998 expedition transmission into a 1997 ford f-150

 

Yes; the E4OD and 4R70W were pretty interchangable. Good luck.

 

the plug on the right side of the trans is diffrent the f-150 has 8 wires in that plug and the expedition only has 7

 

Then the transmission is possibly the other kind. The 4R70W isn't as big as the 4R100. The 4R70 connector is also pentagonal, and the 4R100 is oval. If it's a pin difference, then its a 4R100 with seperate coast cluctch avtivation, I think.