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I don't believe a locker/posi is available for the front diff. but you can get them for the rear, check you diffs for t he code numbers and post them. I'm not into 4wd much so maybe some else can confirm this
There's a regular differential up front and maybe a limited slip rear differential in back, so you'll have a minimum of either 2 or 3 wheels driven, respectively.
Really? The 1988 factory manual makes no mention of a front axle limited slip differential, either in the "identification codes" or in the "axles and driveshafts" section.