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As most people on here know, I have been selling these for about ten years now. I just bought out the last of the supply of NVG149 input shafts from my supplier (they're still available elsewhere, these guys just had overstock at a better price). I'd like to get a group buy going to get the best price possible on these adapters. In ten years of selling these, and guys with up to 1600HP in an Escalade, I have NEVER had a single failure. Ask the manufacturer of the turned down 4L80E output shaft how many failures he has had. This is the best option to upgrade to a 4L80E and keeping AWD. For more information or pics, you can see my old thread from 2009 with details: http://www.silveradoss.com/forums/topic/51391-4l80e-nvg-149-32-spline-input-gear-adapter/ I have 12 spots available on this group buy. GROUP BUY OVER