Changing Automatic Shift Points in a 727

I've used A&A's split shift correction springs too and they work well but if I'm not mistaken he only has them that change the 1-2 shift rpm. You most likely need a stiffer 2-3 shift valve spring and unless sourced from another valve body I don't think you'll find one. The only other possibility is finding a shim to fit behind the 2-3 spring but it'd be guesswork as to how thick it'd need to be to raise the shift 400 rpm. Making the 2-3 shift more consistent when manual shifting is nearly impossible to attain with a factory VB