Front end locked up! Help please!

[Thunderbolt059]

The front end of my 03 Expedition locked up on me this morning when I got to work and tried to park the vehicle! Have been experiencing a pretty sever vacuum leak up to this point and was hoping to get them replaced soon but could be the culprit of my front hubs locking up for no other apparent reason? And what would you all recommend, take it the dealer and let them fix it or do it myself! Will probably have to get it towed to the house today! And still need some way to get to work tomorrow also!

 

[Thunderbolt059]

It ended up being the front differential seized up. Had to have it converted to a 2 wheel drive for now. Was a $1,055 at the Ford dealership and hope to replace the front differential someday. Anyone have any experience with this?