Welded front diff.

[Bazcam]

While I was checking my replacement ifs diff, I noticed the ADD collar that
connects the n/s drive shaft to the diff works along the same lines as the
diff lock on some of the LGV's I work on.
I was thinking, if the diff was welded up and the ADD set up to work
independently of the 4wd system, when in 4wd, you would have permenent
drive to the o/s/f wheel. If extra traction was needed, activate the ADD,
wich would lock up the axle, once clear, deactivate the ADD to regain
steering.
If manual hubs are fitted there wont be any issues on the road.
Any comments welcome.

[lord lucan]

yes i have a welded front, mainly off road, but as you say free wheeling hubs can have 3 wd or 2wd or 3wd locked and 4wd locked front but cant have 4wd on tarmac [not that you need it ]