Its a shim kit for the stock differential. It works pretty nicel from what I've been told. I just bought a tranny that has one installed. This one isn't standard though, the shims are thicker giving more locking.
Peloquin makes them, Velocity used to sell them. Yes, that is his email addy, his website http://www.thescirocco.com . About $ 80, IIRC.
Loved mine when I installed it, you could definately feel the difference in the winter pulling away from a dead stop in snowy weather.
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