I run 32x11.50's with 4.56's and Im pleased with it, however I probably would have gone with the 4.88's had I not found these used thirds pretty cheap. I only have $150 in these third members while I would have had closer to $500-$1000 if I wanted to switch to 4.88's. I like the rpm range of the 4.56's....not too high on the interstate at 70, and I still have plenty of low-end torque. It's really your call, but if you ever plan on going with an even bigger tire, then go with the 4.88.

Heath