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Message: <blockquote data-quote="Vincent Hor" data-source="post: 312108" data-attributes="member: 1221">Brian, no regrets. This gear box runs smooth and pretty strong. For better acceleration use the rear diff with 4.10 However the 3.91 supplied with the conversion kit is quite well matched by the Japanese giving a good balance for off the line acceleration, cruising speed and reasonable economy. I would suggest that you use the 3.91 diff in your initial installation. Have a feel of how the car drives with this diff. Later you can plonk in your 3.23 diff by swapping the rear diff output flange to compare the performance. You will probably get even better fuel consumption and the very nice cruising speed of 160 km/h at 3K rpm. Super quiet and just nice for your ususal long distance drive. I wish I could find a 3.46 or 3.64 diff as I have always enjoyed this gearing ratio when I had my E23 728i and the E28 528i. It would be a good compromise between the 3.91 and 3.23</blockquote>