i have that trans go "shift kit" and it is just a repair kit, not a performance kit. i have not installed it. it is only about 25 bucks so why would you want a GB on it? it involves drilling about 12 holes in the valve body and replacing all the springs and such. i do not think it is for your average joe. but i could be wrong. it suggests that you put in some new stuff which i forget what exactly, but i remember asking bill jenkins about it and it was over 100 bucks. i bought this about 7 months ago.
