dieselpower
New member
So I have a sibling who has a duramax, and he claimed up and down that the allison is the toughest trans out there. then he puts an edge with the hot unlock on it and can't run it above level 4 or it sounds like its a cvt LOL . level 4 might be 100-120 over stock, im not sure. Yet i have seen a 6.4 with a stock tranny dyno 540hp, and it sounded like it was shifting good yet...so which tranny is actualy tougher in stock form?