LOOK FOR LOOSE DISCONNECTED REAR SUSPENSION COMPONENTS. LOOSE DRIVE SHAFT BOLTS.COULD HAVE WORN UNIVERSAL JOINT BEARINGS. I WOULD CHECK AND TIGHTEN ALL SUSPENSION BOLTS AND DRIVE SHAFT BOLTS BEFORE REPLACING UNIVERSAL JOINT BEARINGS.
It's hard to tell, from your description, as to the extent of the clunking.
If it seems to only and constantly occur whenever in forward motion, bumps or not, then I would first check your rear differential, (if 4x4 then your front differential as well).
Check fluid level(s) and if okay, remove cover and check for worn gears and any metal shavings on the magnet on bottom of housing.
Worn gears can toss your vehicle around, any make stomach turning clunks and other awful noises. I've recently replaced a front differential on a 1994 Dakota. It would make same clunks as you describe and a few times would make my back end seem to 'hop' while driving highway speeds. I would check this quickly.
If it only seems to happen over bumps, then your guess on engine mounts or bushings is probably the best guess.
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Does the clunking occur over bumps? or just when the vehicle is moving? or at idle as well?
Does the clunking occur over bumps? or just when the vehicle is moving? or at idle as well?
Is it just when you start moving? Or whenever it's in forward motion?
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