I'm doing a TON of upgrades to my Jeep right now and have a question about the upgraded Dana 30 axles. After much reading and research from this forum, I've decided to go with the 27 spline ARB locker in the Dana 30 and upgrade my front shafts. I made this decision based on several references to the weak point in the 27 spline front axles are the shafts themselves, not necessarily the spline count. There are several 4340 chromoly Dana 30 kits available from different vendors with different prices. For instance, I can purchase a Yukon 4340 kit with Splicer 760 joints for around $600 (local off road shop) with a lifetime warranty, or order a Nitro 4340 with Splicer 760 kit for $475 from East Coast Gear Supply with a listed 10 year warranty. I know it's only a $125 difference, but when your already up to several thousand in pending upgrades at the off road shop, every little bit helps! I have read opinions on other forums about American standard 4340 metal and imported 4340 metal not being the same. I know Yukon is made in America but I don't know about Nitro. I just know ECGS doesn't sell crappy products. I know several companies can get their 4340 from big name companies in the US and put their finishing touches on it. I would LOVE to save money here, is there a difference?