Yes sir' my 4.10's w/ trac loc in a cobra diff came in the mail today. Was said to have only a couple thousand miles on them. When I opened the box I saw the alluminum diff and that rested some of my nerves over the ebay sale. I hoped and prayed when I pulled the cover to see "410" stamped in the ring gear along with an "S" spring. Sure enough all was there. 6hrs later (It's 36 degrees out here, I had to take breaks) the car was back together. Took it for a spin..and did just that spun the tires for a solid 20ft before I caught traction only to break lose again in the shift to 2nd. Wow! That's all I can say. That car freakin' launched after I knew what kind of effect the gears had and how to drive it out of the hole. The gears are great, no wine, no noise, and upon inspection looked brand new, no wear. The trac-loc seems to be in good working order, the car pulled sideways out of the hole..never used to do that before.lol. Now I just need to have my SCT chip reprogrammed for the gears and I'll be set. This should definently be a mod on the top of everyone's list.