Are the 2WD and 4WD transmissions the same other than the tailshaft? Meaning can I take the transfer case, adapter, and midshaft off of any 4WD M5OD and bolt it to a 2WD's case? I'm asking this because I have a buddy who is seriously wanting to convert his 2007 F-150 XL to 4WD but wants to keep his manual transmission. An F-150 4x4's frontend will bolt right on and it will be no sweat to have front and rear driveshafts made. All that is needed is a transfer case.