Well looks like they work. Heres a little background on the car.
1985 Buick WH1 T-Type - All options except t-top or astroroof and remote trunk release. So yes it does have posi. Has stock engine, trans, turbo and rearend. Car is right under 136,000 miles. And it is a daily driver. And very reliable.
Upgrades include: pinion snubber, airbags, shift kit, 87 ecm, lt1 maf, translator, aluminum radiator, 160 degree thermostat, electric fan, adjustable wastegate, k&n filter, 87 coil, 10mm magnecore wires, bosh platinum plugs, boost gauge, fuel press. gauge, water temp gauge, oil press. guage, walpro 307, hotwired and rear seat braces.