I use an auto locker in the rear of mine, similar to a Detroit. It unlocks rather easily for turns, but when I need it, it's on and locked without buttons and the associated wiring that goes with it. I'll be putting one in the front in a couple of weeks. I expect steering to be affected somewhat, but still driveable.
The biggest potential problem with having an Eaton in the front is if the thing gets stuck in lock mode. Just hope that you're pointed in the direction you want to go!
Scot Smith
1994 HMC4, Locked
"They're right, Wider IS Better..."
Southern Axle & SteeringRemanufactured Driveline & Steering Parts for Hummers