mine actualy went tight, very very firm, I tried rocking it back and forth but nothing,

Is it just me or is there a major trick im missing with getting the tail shaft housing back on, i see the manual says rotate the shift mechanism anti clockwise when you install, i tried everything, wont go on, not realy a massive problem as I plan to have my trans guy that does my race cars box's go over it and measure all the gears and shims etc,,,