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I have a custom hill climb car that I built that uses a Subaru Legacy 3.27 rear differential. Since my car used a CVT transmission once the clutches open up all the way then I am out of gear. Right now with a 3.27 gear my top speed is about 120 mph. I'm trying to enter the car into some NASA events this season and I really need to get the mph up to at least 140 mph.

So what ring and pinion does the Subaru diffs use? Does anyone make different gear sets that I can buy and load up my R160 or R180 diff with? I'm thinking that a 2.73 gear would get me right where I need to be.

 
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