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Hi, I have a 1972 240z with some mods from the previous owner, so there are a few things that I'm not sure about. I believe that I have an R180 diff (because of the rectangular back cover). But the gear raito seems to be 3.70:1 (18 tooth blue speedo gear) and speedo is accurate as far as I can tell (my wife was in her car next to me verifying speed via cell phone... yeah... I'm high tech). The speedo was off by about 5mph, but thats because there was a 17 tooth (black) speedo gear in the trans, I switched it to the 18 tooth (blue) speedo gear and that fixed that. My tires are pretty much stock (well, stock size, zx rims) 205/7O/R14 so I don't think the speedo was off because of that. Here's the problem, I don't think Datsun/Nissan made an R180 3.70:1 For a Z car, at least, I have not been able to find any info about such a differential. I did a lot of research and I found that Nissan did make an R180 3.70:1 in the Maxima, Manual trans, but I have no idea if that's true (internet source) . I suppose it is possible that the previous owner put in a maxima rear diff. I know that there was an R200 3.70:1 in the 1979 280zx 2+2 with manual 5 speed trans, but I don't believe that I have an R200 in my car. Soooooo, I have no idea what kind of differential I have. I don't want to take the back cover off right now to look at the stamping on the gears. I would like to put a R180 4.11:1 in (that's from a 84-88 NA 200sx, right?), Or the R200 4.11:1 (85-86 turbo 200sx) Or any other 4.11:1 that is easy to swap into my 240Z. If you have any idea whats going on PLEASE LET ME KNOW!!!!!. I'm stupmed, and I don't want to pull the diff cover off if I don't have to. Thanks in advance, Matt-
