what unit is used in factory front limited slip

[johnw893]

Ok so I have always heard that the rear limited slip was a gov lok (g80) code so what would the 9512aa supposed to be. When I got the truck the spiders were torn apart and the guy at the axle shop told me it was a gov lok when I brought it in and traded it for an open for 80 bucks since he said u can't find the gears for gov loks it didn't look like any gov loks I've seen but assumed he knew more than me it's his job I'm going to be pissed if he ripped me off.