Axle code is G282/G284 for non-LSD equipped vehicles, G285 for LSD-equipped vehicles. This is on the sticker in your driver's door jam, it will say A/TR, this is your Axle/Transmission code.
Sport package USA 89+ N/A models had PPS, TEMS and LSD. LSD was also an independent option that could be had separately.
Sport package Canada 89-90 N/A models had PPS and TEMS as options, LSD was standard.
Who knows, could have been a Canadian car
.
Jeff