rt durango help please.

not an a-body but hoping for a little info please. i have an 01 durango rt 5.9ltr. my flex plate cracked and the shop put in the new plate and now its missing throwing a code for the crank and cam sensor. they replaced both and still same. they are going to pull the trans back out monday and see if they did something wrong but the guy is stumped. i know the flex plate is how the crank sensor reads is their anything i can suggest they look for. thanks in advance. and they are being good about it. taking full responsibility of it and not asking for me to pay for the flex plate job till they get it right.