All bellhousing's are gearbox specific,,, although some can be interchanged (refered to as the short belhousing), so as mention prev tdi box(r38) on a defender is exactlly the same as discovery, allbiet the defender is has the shift remote further forward (refered to as the long stick) and the disco is right in the top of the gearbox (refered to as the short stick) which is infuriating because you would think that it would be simple as removing the the remote shift and adding it to a disco box for to be able to interchange them, but no that was too simple for landrover,,,,,,
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the only gearing difference is in the transfer box,