Kdp is the "killer dowel pin" its a timing case alignment pin that is known to fall out and do all sorts of destruction. sometimes tho it simply falls thru the gears into the oil pan without hurting a thing. Can destroy the motor if it gets in the wrong spot.
here is a link to the repair that explains it much better than I.
http://www.genosgarage.com/GenosGara...erDowelPin.pdf
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Dog's truck:95 2wd ex, built auto, kdp tabbed, 3 disc billet converter,3.54 gears, 4gsk, bhaf, 0 plate, rack plug, 90hp injectors, 191 DV's, htt 62/71/14, timed @17*, 60# valve springs, head studs, 5" exhaust, gauges