These are interesting to add.
Just for people to be aware, if you have an open differential and one tire is on ice (or slippery mud or loose gravel) the truck can still roll/move if you still run the viscous coupler or have the CDL unlocked.
I have used medium trucks with this type of driveline brake and they will slide if one wheel loses traction because the open differential allows the movement.
Probably not the case for
@jcardona1 because of the added special things he has on his truck and he understands how and when to use it.
Just don't think you need to add this for the "cool factor" because it's not for everyone.
I know the older 40 series have these on the back of the transfer case as well. They also stopped doing them that way for a reason.