I wondered the same thing when I took mine out. I'm going to put it back in the same way. If I had a lift to get the truck up in the air I would opt to put them in seperately but I'm going to try and put them in together. I think coming out together was easier than putting them in together is going to be. I still have the front end on my truck. I took out the radiator but the grill etc was too much to mess with. Just had to get it all up in the air high enough to clear. If you have the front off the truck it shouldn't be any problem at all.