Guest kansaskeith2004 Posted September 18, 2004 Share Posted September 18, 2004 Since the 3.70 and 3.90 apparently use the same 10 tooth pinion, I wonder if a 3.90 ring could be swapped onto a factory limited-slip assembly? This would make a "factory" 3.90 limited slip? Quote Link to comment Share on other sites More sharing options...
rags Posted September 18, 2004 Share Posted September 18, 2004 Since you have both a 3.7 and a 3.9 rear, why don't you just unbolt the LSD from the ring gear in the 3.7 and put it into the 3.9 rear? Joe Quote Link to comment Share on other sites More sharing options...
JMortensen Posted September 18, 2004 Share Posted September 18, 2004 The pinion gears have a different pitch on the teeth. Despite the fact that they both have 10 teeth they won't interchange. Just switch the ring gear as joe suggested. If this is an R200 and you have 10mm ring gear bolts on the 3.90 then you'll need ring gear bolt spacers if you are swapping to the 300ZX 3:70 LSD. I bought some from Mat73GNZ, but I'm pretty sure he's out now. What he did was to buy a piece of 12mm OD 10 mm ID tube and cut them to fit. I think he said he made enough and sold enough to make a little profit on them. Quote Link to comment Share on other sites More sharing options...
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