palauoriginal Posted February 20, 2006 Share Posted February 20, 2006 i have a 75 280z and i jus did a 81-83 tranny swap(has a 3.54)...my car is now totally different from when i had the old 77-79 tranny in there. i was wondering what diff i should put in...a 3.9 or 4.11? thnks Quote Link to comment Share on other sites More sharing options...
JMortensen Posted February 20, 2006 Share Posted February 20, 2006 3.9 is what the ZX's came with. I don't think 4.11 is too much, but it's kind of a matter of opinion, and tire size and other factors have an effect as well. This page should help you figure it out: http://www.geocities.com/z_design_studio/ Quote Link to comment Share on other sites More sharing options...
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