if your going to run 31's id say keep your 4.10's or even better find some 4.37's or 4.56's on the cheap. if your going to regear your current diffs i recomend going atleast 4.88 and getting 33's asap you can get by with 31's an 4.88 but have high rpm around 60mph. if you ever see yourself wanting 35s or bigger get 5.29s and be done. 4.88 are ok with 35s but 5.29 is much better. remember you only want to do this once.
