I am looking at swapping out my 3.73s in my 14 bolt 9.5" rear to 4.10s I am looking for replacement ring and pinion. I have found a used some on ebay that are "supposedly" in great condition. I have also found a few gear sets that are new and are about 30-40$ more. Has anybody had experience running used gears and is the break-in time less? Does someone have experience with a particular brand of gears that were inferior or had gear howl. I have heard some stories of new gear that howled, and I kinda know what I am getting with OEM gears. Motive, Elite, Revolution, Platinum Torque are some of the new brands I am looking at. I am familiar with Motive, but Platinum torque seems to be the least expensive. Unless of course someone wants to swap 4.10s for 3.73s I am game. I have the g80 to go with them.