Well, I say that because several of my friends have broken 28 spline axles off the line. The rear end is the one thing I have never broken (never mind snapping tabs off clutch packs in the Traction Lok and taking chunks out of the gears, the car was still drivable after that). I just don't want to risk it, as I seem to have really bad luck with drive train failure. I've had the car for 6 years now and it is on its 3rd T-5. I might take it to the track yet this year on the street tires, but hopefully it gets the 31s this winter while in storage.