Adding springs to clutch pack?

If you want to modify it, like install a shift kit, I recommend Trans-Go TF2. Stay away from B&M. I got a 440 and trans from the junkyard, but the trans had a broken rear band. I rebuilt it with a Trans-Go TF2, and that old Chrysler 300 lo-po 440 could lay down 20 footers hitting second gear, and chirp third sometimes.