Compression Ignition Addict
Join Date: Oct 2011
Location: Chico, California
Thanked 259 Times in 250 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 265k Full Force 160/30, PHP Hydra, S&B CAI, 4" Exhaust, Van Turbo, RR 6/6 Billet Wheel, Autometer Gauges, Transgo Tugger/sonnax shift kits, Non-Ebpv Pedestal, 08 Tow Mirrors, Trucool Max.
Dad-2000 F250 7.3 4x4 114k Autometer Gauges, Superchips 1705 (Tow Safe), Blue 6637, 4" Exhaust, BD Billet Wheel, Trucool Max.