I just installed a B&M 3000 stall 10" converter; changing from a 2000 stall 12"converter. B&M instructions say to use either B&M trick shift or type F trans fluid. Now it seems like the trans doesn't shift as hard as it used to.Previously, when it shifted at part or full throttle, the shift was very hard,and would churp the tires with each shift and quick.Now it seems like it's slipping into gear.The car runs great; but it feels like it's slipping when accelerating also. Fluid level is ok. Is this just the reaction of the converter or the result of using different oil? What is the difference between type F, dextron II and B&M trick shift? Car is a 1965 Rambler wagon w/493 hp 383 4.10 posi rear and a shift kitted 350 turbo.