spicer 1409 transmission

hey guys,
I just installed brand new 1409 into a 88 international with a old Cummins. I also installed new shift tower, set all adjustment to spec, also running a 15.5 inch Eaton clutch brand new.
I cannot get it to go in gear. I can get it to go in R 2, 4 so all forward stick pushing gears. when truck running I cant put in any gear. what is going on?
only thing I'm not sure about is the little square plate which moves onto of the gears, where the shift lever rod goes in . I have it set top position and in middle. i insert the lever in middle and tower case sits in as it should. but cant shift.

 

thanks for reply. it is a pull type . yes on correct side. so even with engine off I can get in most gears, indicating clutch has nothing to do with it. if I understand correctly. even without pressing clutch engine off you should be able shift through all gears. I tried this on 3 brand new trucks in the shop. when engine running then clutch comes in play because it needs to push on disc to be able to shift.
I still believe it is a shift tower issue. like the square part where the shift lever goes , called interlock plate. in service manual does not indicate the position to place it . should be in middle , left of right during install?

 

true. what about my clutch brake? what if that's not set perfect?