need help wont shift into third

I dont know the year of the tranny. it was built by john cope. I ordered it from him. everyone here said to buy from him so I did. friday Im taking it to a local trusted shop to look and repair if needed whatever it is thats going on. its a fully stock 904 from crt racing. its brand new rebuilt trans. I just havent had any luck with transmissons at all. its really bumming me out. almost makes me wanna say f**k it Im done with cars. I spent a grand on this trans. I work late during the week so I havent had a momeant to call him. its him and his son that works there in the shop. idk maybe his son made a mistake? no ones pefect I realize that as Ive made mistakes.