4T65E Tranny help needed

I'm in the middle of installing a Thrasher Performance shift kit in my 04 Grand Prix and think I got the pistons mixed up. I know, stupid move, but now I need to know which one has the heavier spring on top. They looked the same at first, but now I see that one has a heavier spring than the other. I'm thinking that the 1-2 piston would have the heavier one but I'm not sure. Of course it's Sunday and I can't get a hold of anyone at Thrasher. Thanks for any help.