This is a brand new aftermarket transfer case rear case 1/2 for either a 261XHD (manual shift) or 263XHD(electric shift) GM transfer case. This will fit the heavier versions found behind the Allison automatics and ZF 6 speeds. The casting number is 25909, the New Venture part number is 25900, and the original GM Part number is 12478092. This case already has a new rear bearing for the front output shaft in it as well as a new tailhousing bushing. This case is cast aluminum and is much heavier and stronger than the magnesium. These are the highest quality cases that I have found. I have sold or used more than 500 from this manufacturer without a single issue. Be sure to reuse the hollow dowels at either end of the case when reassembling. Shipping is FREE in the continental U.S. Please see my other auctions for more great 4X4 parts. We ship UPS daily until 5:00p.m, so shipping is lightning fast.