I just upgraded my gearing from a 3.15 to 3.46 yesterday. I don't regret not getting the LSD. I don't know what your ultimate goal is for upgrading your differential. Is it to just pick up more speed, or is it to transfer the power between the rear wheels?? I wanted the diff to pick up more speed and my 3.46 definately did the job. If anyone want's my diff it is for sale.