[Rory428]

I know that this is an old thread, but I just ran across it. I have been running a Jerico DR4 in my low 10 second 428FE powered drag car for over 6 years now. I run the car regularily, over 100 passes per season.Dump the clutch at 64-6600 rpm, shift WOT at 6200 RPM, and I couldn`t be happier with the Jerico. I pulled it out last year, to try some different gear ratios, and we were able to re-use every dog ring over again. They had some minor chipping on the edges, but otherwise, still look (and work) fine. I have no idea how it would work in daily street use, plus they are noisy & clunky, plus I never downshift mine, so I doubt the drag race version would be ideal for a roadrace application. But I bet a NASCAR version would be OK.