
Originally Posted by
chituntang
IMO, I would take the smaller number final gear for gas mileage. But I do my project around my DD, so mpg is a huge factor for me. But if this is a racing project for you, then I would go for the 4.0 something diff. What are you going to do with the output shafts and axles? People with high power 240sx breaks their axles and do the q45 conversion...
Keep us the update cause my friend would do the same if he can find a good, cheap z32. I believe you are doing everything right and it will have a great outcome.