Some Ford 4wd with auto locking hubs with the nob you could pull the nob out and was suppose to lock the differentials in giving you true 4 wheel drive. Was that way on the last F150 I had but never used it. Would not operated it on a hard surface.
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Kenny & Susan
2017 Passport 2670bh
2017 F250 6.2 4wd
Equalizer 4 pt.
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