ABRODERICK43

Hey guys, need some assistance on figuring out why my transmission is acting up. Truck is a 2011 Chevy Silverado 1500 Crew Cab with a 5.3L v8. Has 236,000 miles on it. When i start driving it will move in first gear, once im in second gear the truck wants to bog down and lose power like its under a heavy load. seems to be stuck until about 35-40 mph. The rest of the gears seem to be working properly. The truck had a few codes for engine but none for transmission. 1 code was crankshaft position sensor and 1 was a camshaft position sensor. I changed the camshaft position sensor and relearned its process. Still have no luck. I'm not sure what else to look for or go about this. Anything helps at the point!!