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LOOKING FOR INFORMATION ON WHAT YEAR Z,S USED 3.9,3.7 REARS.i UNDERSTAND THAT 260 AUTOS ALL CAME WITH 3.7 DIFFS.
ALSO SOME DATSUN TRUCKS COME WITH LIMITED SLIPS 4.33-4.11.DOES ANYONE KNOW THE YEAR-MODELS.PRIMARILY INTERESTED IN 180 OR 190 DIFFS FOR E-PRODUCTION CLASS IN SCCA
 

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No stock Z's in america...early ones now, came with those ratios. The automatics had 3.54 in them. 4 speeds had 3.36. English models with the 2 liter sohc motor had 3.9's (RHD) So did the Japanese home models.

One thing you can do is find a 510 wagon with IRS and steal the diff. It was a 3.7, but a smaller R-160. Will bolt up perfectly and work just fine.
 
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