AS CrossfireRush noted, it is not a posi. It is an electronically controlled limited slip. And, the stock version of this is OK, but could be a lot better. Thus, several years ago, WaveTrack produced a true limited slip differential for the SRT6. I have had one installed for a number of years, and it works pretty darned good. It really produced a marked difference. I don't know if they are still available, but there might be a few of the still for sale.