[vettestr]

We run Vette IRS but we also use the Vette frame so just a natural. It is a great unit and the Dana 44 has been around for years so pretty much figured out and proven to point of perfection. Same unit used from 1968 until 1980 when they went to an alum housing but still interchangeable internals and so on. Also since its years of being raced and marketed there are many aftermarket parts avail;able. The fact they are the 3rd generation Vette and they are now selling Gen 5 Vette makes them very affordable. The street rod guys go after the gen 4 stuff so again more availability to gen 3 stuff. The G4 items were lighter sprung weight but aftermarket g3 is also reduced weight so there ya go.
The G3 car was in the 3700 pound range so pretty beefy, I have never grenaded a rebuilt C3 IRS even with very healthy big blocks. I have broken one 1/2 shaft U-joint but that happened at low speed/RPM so almost no damage. I do recommend Hoops for all drive shafts in any car used as a TOY. Lack of traction probably saved all my cars from IRS damage but they are not drag cars and a big block in one of these will just roast tires regardless. I do think they get better traction than most IRS units out there because of the design. They seem to squat N squirt as only way to describe launch.