whats wrong with my transmission

i recently put a rebuilt 5 speed tranny in my 93 3000gt vr4 i havent even put a 1000 miles
on i maybe drive it once a month. i accelerated to 45 no problem the car made no noise
but when i got into the store parking lot i had lost 1st 2nd 5th and reverse any ideas
whats wrong would be greatly apprieciated