1964 Dodge Dart 904 transmission stopped working

Buy this book written by @VOETOM. https://www.abebooks.com/servlet/BookDetailsPL?bi=30284411690&cm_sp=snippet-_-srp1-_-tile4&searchurl=ds=10&kn=904+transmission&sortby=17
Read it twice cover to cover. It is indispensable and worth every penny. Buy the parts and take advice from A and A Transmission. Overhaul it yourself. You CAN do it. On zero experience, I just did mine for less than $500 before buying a torque converter. I installed a mild shift kit and replaced both the kickdown and reverse bands.