Transmission & Differential - rebuilt tranny

Hey guys i just put in a rebuilt tranny in to my 94 Honda civic ex. it had a almost new clutch put in not that long ago. so the problem i am having now is when i go to put it in gear it is really hard but it go’s in with out grinds what do you think it wrong

Check the fluid level.

Ya the thing is I never disconnected the master cylinder

DOB (dead outta box) trans possibly? it would suck if you had to switch it out again but dont rule out shotty workmanship, my buddy blew out 5th gear in his trans on his Cavalier (under warrenty) and it was in the shop for 2 weeks because everytime they threw a factory chevy rebuilt trans it had the same problems. so if you had a shop put it in take it back and make them fix it if you did i would get the oppinion of a local mechanic.