I was working on a truck a few days ago with a noise, I replaced the steering shaft and the noise was still there. I found out when someone else put new coils in the front they wasn't put in right and when you hit a bump they would make a noise. I'd check the placement of the coil springs that you just put in make sure they are seated correctly.
i just saw this thread and had to chime in. if you lift your 2wd with 3" springs, you need to cut your stock bump stop off, like off the frame. its the bottom of the bumpstop (metal part) hitting your spindles. trust me on this one, here is an article
could be the steering gear box. i replaced mine and it took the clunking noise down to about 50% and it made it drive better. but i think the other part is the steering shaft itself.
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black 2001 ram 1500 sport. thrush glasspack,painted black sidesteps, black windows,black headlights. cb installed,whips. black truck club member #084
when does your clunking occur "townsley4" or when did it occur. Mine occurs occasionally when i turn a corner, or my truck has a weird suspension flex like coming out of an angled driveway. Its very weird and annoying i must add!!!