e.g if I were to take an AWD and weld the diff it would be 4WD (and not be too fun for daily driving)?
The whole conversation is a bit tough because there are a LOT of blurred lines. Some 4WD systems can act like AWD systems. Some AWD systems can act like 4WD systems.
e.g if I were to take an AWD and weld the diff it would be 4WD (and not be too fun for daily driving)?