Like the title says... I'm wanting to get a posi, not a locker. I'm just wondering if anybody knows how durable these posi's are. Will it hold a mid 11 sec rcsb truck? They look beefy in the pics.

 

The Duragrip is basically an Eaton Clutch Type Posi. How well it holds up is dependent on too many variables, and the same can be said for the durability of most aftermarket differentials. IMO something else will break before that unit will.