Through the top I put them in seperately its easyer but you need experiance getting gearbox in but I can do it in about 2hrs this way (only bolted in not hooked up) if you have a hoist drop the subframe. undo the hicas crap lines etc undo coupling from steering col-rack, remove you waistegate actuators, put motor and box onto crossmember bolt up mounts,drive shaft/axles, use 2 gearbox lifts 1 under crossmember 1 under gearbox raise up slowly bolt up. I looked at doing it from top box attached and it look like a world of hurt to me. But if you try it let us know how you go. if you need more advice pm me.