He took it out last weekend to break in the engine before we tuned it. The area he used to have the biggest issue with was the deep sand washes. Before it would take him a while to pick up enough speed in second to shift to third. Once in third he would start to slow back down and have to go back to second. He didn't go into as deep of sand as he usually runs in but he said in the sand he was in he was only giving it half throttle in third and the truck had no problems.
Here's a video of one of the pulls.