I have a 83 subaru gl and I also just got a 1980 dubaru tje 83 is front wheel drive and u the 80 has the 4wd option. Can i pull the rear end to the transmission from the 80 and put it in the 83. Also can do i have to swap the 5speed from tje 83 to the 4 speed in the 80 or can i keep the 5 speed