Guest skimattybee Posted June 22, 2011 Share Posted June 22, 2011 (edited) I recently pulled a r200 diff. from an 81' 280zx 2+2 to swap into my s30. i was told that that diff has the 3.90 gears. can anyone confirm this? i also pulled the 5 speed trans. any idea on the gearing for that as well? i did a pretty thorough search on the forums but no findings on the gearing of the diff. of a s130 2+2. any help is appriciated! Edited June 22, 2011 by skimattybee Quote Link to comment Share on other sites More sharing options...
ArchetypeDatsun Posted June 22, 2011 Share Posted June 22, 2011 (edited) It most probably is a 3.90 if it's a R200 out of a non turbo, that's what my 81 2 seater is. Edited June 22, 2011 by 280zx@541 Quote Link to comment Share on other sites More sharing options...
FricFrac Posted June 22, 2011 Share Posted June 22, 2011 Hayes says it's probably a R200 3.9 and a lot of them were but the real world doesn't always match with what gets put into the cars in reality. I think the turbo with the T5 is always matched up with a 3.545 that I've ever seen or heard of. The rest is fair game Sounds like you have it out of the car already when you pulled the trans? Easy enough to figure out if that's the case..... Quote Link to comment Share on other sites More sharing options...
BluDestiny Posted June 22, 2011 Share Posted June 22, 2011 My 81 2+2 had an r200 with 3.9 gearing. But I'm sure the diff had to of been been replaced. The car had almost 220k miles on it. Quote Link to comment Share on other sites More sharing options...
Leon Posted June 22, 2011 Share Posted June 22, 2011 It's simple enough to check yourself, as far as the diff goes. Here's some transmission gearing info, among many other sources. Looks like it should be a 3.9 with the "late" ZX 5-speed. Quote Link to comment Share on other sites More sharing options...
NewZed Posted June 23, 2011 Share Posted June 23, 2011 The FSM will tell you what the stock setup was. In the PD section. If the differential is out you can turn the input shaft until the two drive axles make one revolution. Mark all three with white out or similar. As long as both outputs turn at the same rate, it's pretty accurate. The input shaft will either end up at 1/2, 3/4, or almost one full turn from where it started after one full turn of the drive axles, and 3 plus turns of the driveshaft. Quote Link to comment Share on other sites More sharing options...
Guest skimattybee Posted June 23, 2011 Share Posted June 23, 2011 thanks for the helpful info! here are some photos of just for fun Quote Link to comment Share on other sites More sharing options...
tec280zx Posted June 26, 2011 Share Posted June 26, 2011 You need to pull the diff cover to tell for sure. A number will be stamped on the ring gear. 39:11= 3.54 39:10= 3.90 37:10 =3.70 37:11 = 3.36 Quote Link to comment Share on other sites More sharing options...
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