Congrats!<img src="/forums/images/graemlins/kewl.gif" alt="" /> What model Jeep? I'll assume Wrangler. Stock gear ratio depends on which engine for one thing, A 4 cyl should have 4.10 stock, a 4.0 six should be 3.07 stock. These are the most common gears anyway. I never heard of a Dana 66, A dana 60 is overkill. A nice Dana 44 or Ford 8.8 or 9" are popular swaps, you are not likely to need anything stronger unless you plan on replacing the Front axle also and going Monster Jeep or something. How large of tires do you plan to run? What kind of Wheeling? These are the factors that determine if you might enjoy a locker in a D35 or be sentencing it to death by installing one. <img src="/forums/images/graemlins/cheers.gif" alt="" />