13. With that, Brett was ready to slide the Magnum under the Camaro. Before installing, the shifter had to be removed or the trans wouldn’t have been able to go high enough to get the crossmember in place. To keep things from falling in, we taped off the hole, but if you’re really industrious, you could fab up a block-off plate. We also took this opportunity to pour in our Dextron III trans fluid through the shifter hole.