I was just wondering if anyone has tried this spring replacements in the ally 6 speed. Does it really make that much of a difference when adding a lot of power to the stock tranny or is it gonna go anyways? Would love to know before I really start adding some serious power.

look at the sticky under allison aftermarket

Check out this sticky http://www.dieselplace.com/forum/showthread.php?t=106158 It should give you all the info you need about the Bully Dog.