[Formulajones]

I've had one of those cone style Auburns in one of the 12 bolts here for what has to be 25 years or so. Has worked fine all that time with a lot of drag strip passes and burnouts. I've noticed it's starting to show it age though when I'm on a prepped track sometimes it slips and spins one tire. On the street it's fine.

Biggest issue with those is they aren't rebuildable so it's destined for a door stop.

If clutch style units are what you're looking for I prefer the Eaton units, as they are rebuildable and parts still available for them. Tru Trac's are nice and I use them in a couple cars. My only complaint is they don't offer a 12 bolt 4 series Tru Trac for 30 spline axles. I either have to go up to 33 spline axles or drop the gear down to a 3 something for the 3 series carrier.