unfortunately I didn’t realize the gmt400 9.5s came in two different widths the axle I have only has a 65.5” wheel mounting surface width. 3 inches narrower than the 10 bolt. The heavy half ton axle shafts I was going to buy to stick in this axle are about 1 3/8” longer per side, so that mean’s I should have looked for a heavy half instead of a k2500. If I run the longer shaft in the narrow housing the bearings will still ride on the bearing surface of the axle but it will protrude past the housing an extra inch. I still think I will have room to weld on the 10 bolt backing plate mounts but the tech from Richmond gear advised against the stick out. So now I’m kinda in a pickle. I guess the only thing to do is eat the cost of this axle and start looking again.