the crankshaft wont turn and car wont start

Hello, plain and simple - something is wrong with the installation or the transmission that has been used. Nothing else has changed, unless you're not sharing something about the engine prior to transmission replacement. You may not want to hear it, but the transmission should come back out and the engine should be turned to ensure it moves. Then, the transmission should be checked to ensure all components are moving as they should. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops