tranny problems 700r4

[snacob14]

ok, so i've got an 87, just put in this junk yard tranny about 150 miles ago. It was shifting good at first, now all of a sudden it doesn't want to come out of first gear unless I rap the thing all the way out. I don't know what rpms but its really high. then it won't go into 3rd or 4th. I did the initial adjustment with the tv cable of holding it wide open and clamping it, but that was it. It seemed to be shifting fine. Fluid is good, what other possibilities are there?