4.56 vs 5.13s
my opinion is that you do not have enough cam now to pull the 4.56 with that size slick. using a 5.13 will be worse as you are already buzzing through the torque range with the 4.56's. i feel like some of the other's stated that a 8" convertor will do the job. also a cam change to something in the .650"-.700" range will produce the torque numbers in the range that the gears will want would be worth while checking into.
