[my59f100]

Hi, I'm helping my son with a 1987 Camaro. We put in a 350CID with a 350 Turbo automatic. The trany was bought about 2 years ago from a transmission guy claiming to be rebuilt and it looked it. We put a shift kit in it got everything running fine just finishing up the car recently. My son is just about to put his first car on the road and now we only have reverse????? I checked vacuum lines and shifter cables even dropped the the fluid and checked if internal linkage was working properly and it seems okay. I can't go back on the tranny guy since I got it so long ago. Any suggestions????