Well prolly getting a 350 tbi soon so now this Is a real project now what tranny do I want narrowed it down to np4500,sm456,sm420 I know I want a dana 300 t case with dual stick what do u guys think or suggest I know the sm420 had a 7.05:1 or the sm456 is a 6.55:1 and u can get a 4:1 for the dana 300 so? What to do