First of all, thanyou very mucho for your answers/advises. I will gor for the 5.29, if it is tol slow, there would be nl otjer way tahn bigger tires.
Btw, since making comparisons between 4.56/32" and 5.29/33", while running 2H, the only difference is less than 200 rpms, 2nd to 5th gear, but in 4LO, do you have any idea how different (higher rpms) would the truck be?