Does any one know what kind of mods i would need to make to replace my th350 with a th400. Currently i have a 1993 suburban 1500, i have replaced the 4l60e with a turbo 350 and it has came out. I bought a 90 suburban that has a th400 in it and it has a 241 also. The problem is the 93 has a left drop and the 90 is a right. Also it the left drop has a 4 bolt pattern and the right has a 6? Can any one tell me if this will work? Is there an adaptor out there for this application? Do i need one?

Just incase anyone out there ever runs into the same situation that i did, you can swap parts in these transfer cases! I tore both of mine down and swapped the input spline hub, main shaft and front plate. Works like a charm!