galant gearbox fitting????

Hi everyone i have a 1990 GLS 1.8 5speed FWD galant, i have recently replaced the clutch but having trouble refitting the gearbox, i can't seem to align the thrust bearing shaft and the flywheel shaft so the box won't slide in can any help? i spent 3 hours trying to get it to fit but no go!! its driving me mad there must be something i'm missing or not doing right. so please anyone with any ideas let me know Thankyou.