Compression Ignition Addict
Join Date: Oct 2011
Location: Chico, California
Thanked 233 Times in 224 Posts
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the system is called ESOF or electronic switch on the fly.
their is vacuum lines that run to the hubs that engage them.
check these lines they often get dry rotted and wont hold pressure to engage the hubs.
and yes you can lock them at the hubs.
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99.5 f250 7.3 4x4 260k FF 160/30, PHP Hydra, S&B CAI, 4" Exhaust, RR Billet Wheel, Autometer Gauges, Transgo, Non-Ebpv Pedestal, High Flow Outlet, 08 Tow Mirrors.
Dad-2000 7.3 4x4 110k miles, Autometer Gauges, Superchips 1705, 6637, 4" Exhaust, BD Billet Wheel, TruCool Max