Lockin your hubs and lockin your diff = two different things. Locking the hubs will allow the power to go to the front wheels, lockin the diffs keep both front or both rear tires goin together. Locked diffs are NOT good on pavement, but runnin around town with your hubs locked when you think you will need it will NOT hurt a thing. Limited slips and even electric lockers come on quite a few trucks from the factory. Fords run a trac-loc in every GT mustang and alot of F-series trucks. The Dodge Ram Powerwagon and some new Jeeps have elec. locking diffs. My cousin's 2wd Tacoma has an elec. locking rear diff. They are great for gettin out of a snow drift or lockin up off road for even more traction. My 88 F150 has open front and rear but will soon have a trac loc rear.
Matt
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