My mate has just blown the diff up on his xr4i,he wants to fit an LSD from a 2.9 xr4x4 but needs to know what drive shafts to use as the xr4i ones push into the diff and the others on the LSD bolt up to the flanges on the diff,will the flanges come out and then the xr4i shafts just push in or will he need to use the shafts and everything from the xr4x4