have you taken it apart and looked at the state of the splines? Is it deffo the gearbox?
 
yes i have just put it in my landie the box has been modified to fit to a nissan motor the splines were well worn but i had to get it back on the road
 
It's going to be a strip and rebuild then, or modify a new unit, make sure you fit the cross drilled transfer box shaft and/or oil splash plate to prevent wear in the future
 

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