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POTATO
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I imagine the rear was prolly swapped out w/ a 3.72 differential, those seem like high mph for those rpms, I had 3.72s swapped into my Silpra but I had taller tires on it, so I can't tell exactly, but I know my car certainly doesn't do 77mph @ 3100
I imagine 3.72s would cause the 7mph difference or so, but you can always spin the driveshaft and find out that way, also, you'll want to jack the rear end up and spin your rear wheels, if they both spin in the same direction you have LSD, if they spin opposite from each other, they're non-LSD
 
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