I bought a stage 3 hill killer trans. It was in a slight accident, had a tailshaft housing cracked. It was replaced and the truck was driven around after that. It has 3,000 miles on it. I installed the transmission, checked all fluids and they are good. However, when I put it in reverse, it struggled to move. It then wouldn't go into drive and the cluster started to flash and now it wont move at all. It is throwing 4 different codes: P0841, P0700, P1713, P0701. I thought it was my NSBU switch so I switched it with the one from my old transmission. This did not make a difference. I don't know if there is a way to adjust those or what the problem could be. I need help!! I need my truck up and running by next weekend. Please, any help would be appreciated.