positraction was not installed on all Camaro's, it was an option which you could order your Camaro with, along with various axle ratios. The Positraction option was number G80, it cost $42. Optional axle ratios were an extra $2.00

Silverhawk...Positraction was a option that you chose on an order sheet. I don't know if there were any stipulations that you had to have any other options chosen. There may have been an issue with the gearing of the unit, tho.