Anything is possible with time and money but I would not think it is economically sensible to swap the drive train from a EF2 to EF1. There are not a lot of Earth Force machines out there to start with and a quick Google search didn't find even one salvage model so where would you even find a drive train donor? If you just have to have an EF2, sell your 2WD and find a 4x4 model.