3-second answer: Sagging tailgate = worn hinges or stretched cables — new cables (~$30/pair) and hinge pins fix it. Won't latch / rattles = the striker adjustment and the latch mechanism — loosen the striker, slam-cycle it, tighten. Tailgate drops open on bumps = the latch is worn — replace the latch before it opens at speed.
The fixes
- Cables — the steel cables on the sides stretch and the plastic sleeves wear. Replace both sides (they're handed).
- Hinges — the tailgate hangs on a simple hinge at each corner; a worn pin = sag and rattle. New hinge pins/bushings tighten it up.
- Striker/latch — adjust the striker so the latch catches cleanly (a half-turn of the bolts changes it). If it still pops, replace the latch mechanism (~$40).
- Bed rail caps — while the tailgate's off, check the bed rails for rust under the caps (the rot you don't see).
Safety
A tailgate that drops open while driving is dangerous (and illegal in most states for a reason). If the latch is at all iffy, fix it before hauling anything.
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Threads
- FTE search: tailgate