The final adapter setup we used included an adapter on the back of the automatic and a 1 1/4-inch spacer. We clocked the Atlas to get a near flat belly under the truck, and only had to notch the crossmember slightly. A tranny mount from Energy Suspension fit perfectly on the adapter, but we had to slightly modify the crossmember. High Angle Driveline outfitted our gearbox with a rear-driveshaft parking brake since none of our axles had parameters for one. We like to be difficult, thus we ended up modifying his mounting bracket so we could reach the stock e-brake cable, but it locks up great and should hold the truck on any hill if need be.