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Hello everyone, I am new to the forum but have been lurking for a few years and reading as much as humanly possible. I have been working on a Subaru STI R180(3.9 ratio) for my ld28 240Z project and came across this post: http://forums.hybridz.org/topic/36312-turbo-diesel-questions/page-3?do=findComment&comment=289554 stating that his gear ratio is 3.36 is the lowest available for the R180 but more mpg gains could be had if lower ratios existed. That got me thinking if it is possible to fabricate a 3.13, 2.9 and 2.72 ratio ring and pinion set for the STI torsen R180. The machine shop that I go to for most of my custom fabrication needs has all the equipment to fabricate ring and pinion gears. I have brought them the STI 3.9 ring and pinion as well as the stock 240Z 3.36 ring and pinion as a sample and they told me that they just need the proper specifications to fabricate them. From what understand as the ratio lowers the diameter of the pinion increases and the gaps between ring teeth widen. Would the pinion be too large to fit in the housing? Is this the reason there are no lower ratios? I assume that a 3.13 set would be a 31 tooth ring and a 10 tooth pinion, a 2.9 set would be a 29 tooth ring and 10 tooth pinion, and a 2.72 would be a 27 tooth ring and 10 tooth pinion. is this correct? Thanks in advanced for any information