Some times when the gearbox is out of the car and stood up on the bell housing if it gets a bump one of the selectors can drop into gear leaving the stick in neutral position, so then you have 2 gears selected at the same time locking up the box.
What you need to do is remove the extetion housing and put the 3 selector shafts in neutral and put it back together.
Good luck its not to hard.
MATT.
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