We need some pics.
Where did it crack?
The trans should have butted up to the bellhousing before you put the bolts in.
Never try to suck the trans to the bellhousing unless it goes really easily.
If it starts going hard, STOP.
I think either you don't have enough room in your crankshaft for the input shaft or the clutch alignment is wrong. You did use an alignment tool when you put the clutch on the flywheel...... right?
Do you have a FSM?
