i am looking to upgrade from my current truck, a 77 reg cab f250 to a 93 crew cab long bed. my question is are there any specific things to look out for? the trans was recently rebuilt, cuz i think its an e40d and if so i have heard that they are weak trannys.

also what kind of gas mileage can i expect? it has the 460 motor, same one i got but i did a bunch of work to mine and can get 12 if i baby it. this will be my first truck with a back seat or anything behind the seat besides some speakers. any comments or help is greatly appreciated. thanks.