I installed new clutch, pressure plate, throwout bearing . When the shifter is moved through gears, the the transmission will not lock up. when the transmission input shaft is rotated the transmission will not shift into gear and lock the axles into drive. I can spin the input shaft and hold the axles and they don't rotate. they never lock into gear. I am at a loss, and have no clue, I'm thinking something broke in the transmission. Any ideas?