I'm pretty sure there has been an upgrade since then. At some point in the past, Keith discussed tweaks in the gear 'set', or whatever the correct term is for face angles as gears mesh. I think the Car and Driver experience gave them some valuable feedback on abuse.
I would imagine that the C5 Corvette is running with a radiator for the diff. I think the current Iso-Torque runs cooler than the Car and Driver prototype, but I don't know how much lighter, cooler and more efficient it is.
Running the incorrect lubricant wasn't the worst mistake that team made. I think they even wrote about a short in the gas tank in one of the magazine articles about their adventure. In spite of all that, they managed to make an overweight, underpowered, barely prepared car very competitive at times during the brief effort. Now let's get the ad agency working on some news about Heinricy and his secret weapon. Some news bits in the media this week and next, so local gearheads could see him in action at the Glen on July 9th, would be nice. EOM
