Well
Basically there are four. The stage right mechanical thing, real cheap in price, more of a novelty, but trans damaging in long run.
Does not set correctly at all times and slow release.
then PTS Xtreme has the Bat Brake. Electrically operated and shifts automatically if desired. Not cheap in price and A performance pan is mandated. Works exceptional. Low sprag protection. Internal modifications are necessary and billet parts are recommended.
Then, Ck Performance has one. Electrically operated, Internal Modifications are required as well and billet parts are recommended. Works well from what I hear and I am not sure about pan mods. Also, not cheap in price.
Lonnie Diers has one too. Electrically operated, similiar to the Bat Brake but manual shifted I believe. Works excellent also. Not cheap.
That is what I know of that is on the market right now.
Bruce
WE4