I have the same problem but mi case is opposite i have a gtr r33 rb26dett 1996 and i buy a gear box of gtr r32 rb26dett, i have the center trasnfer bad on mi gtr r33, the speedometer of this gear box gtr r32 y cable and mi car is a electronic, are diferent, i want to know if is necesary to used the speedometer i know the speed on mi cluster don´t gonna workd, but i want to know if do cause others problems in mi car or others think don´t gonna workd too, or what can do you think are need do, i living in california and here don´t have a lot parts of this cars i buy the only gear box here and is a gtr r32 please help me about that......