[68Timber]

If the hubs are already installed, you should be 2wd when the hubs are unlocked. The front driveshaft and front axles will still turn but are unlocked at the hubs, so the front tires are free wheeling. I guess there's some parasitic drag, but this is the cheapest, easiest route to getting that full-time 4 wheel drive xfer case let you have 2wd.