I have them on my 90. They work great never had a problem with them. Just have to be damned certain to lock them before you EVER engage the 4x4 or you will destroy the viscous coupling in the NP229 case. Presuming that is whats in your 86 with the 360/727 trans. Advantage is you can dis-engage the front axles shafts, gear-set,drive shaft. Idea is that you can save economy by removing rotating mass and parasitic losses when not needing the 4x4.
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06-Corvette z51-6spd,b&b,K&N low miles.
77-Corvette Stingray 496 BBC/TH400 built 667hp+
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96 Cherokee Country 4dr/2x2 White/Tan 3" Lift Sahara 18" Wheels 32.5"'s 99up head and intake- for sale soon!