So ive had my 87 gn in the shop for a month month now getting cam lifter timing chain heads and intake ported..today I get a call that the car is ready but theres a problem,my converter and trans out..which were perfectly fine when I drop it off..when I go tje car does go reverse like if its on neutral and when shift to neutra it drives forward like if it was on drive..any ideas what it can be..did the shop do anything,are they trying to scre me over