I currently have my receiver on the receiver tray thingy. I dont like it there and might move it forward. But I think in order for it to fit with a full size servo you need to put the shorty in the back/back position. The battery tray has 2 positions for fine tuning. The car came with it setup in the back/back but i moves the front holder forward because I thought i might want to play with battery foam for quick changes. Plus in the back/back my shorty was a very tight fit. I actually had to pry my pack out. I was worried about hard landing cracking my pack because it was soo tight.