Corvette's have had it since 1963. Truimph used them in their TR4's in the early 60's, so they have been around in one format or another for a long time. My 34 Plymouth street rod has a 81 Vette IRS in it. Expensive to acquire and to install and maintain. Would have preferred a standard axle setup, as ride is not the best especially in a car that would be heavier than the donor car.