leftys4js

Hello all after all the great advice i got here awile back about a bad shifting tranny i got another valve body and it worked great..its a 91sc 1.9 DOHC auto.got another engine 61k mile on it took it to a back yard mech(joke) it ran fine shifted perfect on the way there..Got a call tonight after almost 3 months ITS DONE..went to pick it up runs fine EXCEPT it over heats and low coolant light and check engine light on,and to get it to go you have to drop it all the way into low it shifts, but no reverse and no park..park acts like nuetral. reverse indicator all the way down to low it shifts into a drive gear now is it possible its just in need of an adjustment? and a new ECTS any great advice would be GREATLY APPRECIATED
Thanks