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Ford ranger chassis problems
I haven't had a Ford for a while and I have not had your specific problems, but here goes anyway...
I would look at the body mounts for the groan. When you get this sound, it may not be simply the left turn etc. that is causing it but may include the general twisting that the turn causes on the frame and flexing at the body mounts.
I have had lots of leaf springs on many different vehicles. Some have squeaked and others haven't. On the squeaky ones I lubed them with oil. I had better luck with motorcycle chain lube lasting a bit longer, but since it is open, it will wear off. I have never seen a truck leaf spring with isolation pads. That doesn't mean that they aren't done, but I don't know anything about them. I have had Fords, Toyotas, GMCs, ...
I do tend to like the high performance polyurethane bushings that are sold for leaf springs. If you have some metal to metal contact at the mounting site, this may help and will last longer.
Now that I think about it, you should also check the bushings on your anti-sway bar on the front of your truck. That could make a groan if you twist the truck frame and the bushings are worn so that the bar is contacting metal.
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Ford ranger chassis problems
If it has been doing it since it was new, I would start with a little silicone spray. I had an annoying noise on the H2 and it turned out to be the hood sliding over the rubber stops when the frame flexed. A little silicone did the trick.
Your problem seems to be more related to a specific configuration. Besides, the hood noise sounded like it was coming from up high.
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Ford ranger chassis problems
If the groan is that loud, I am sure that you are correct about the silicone.
I am still inclined to believe that it has something to do with the suspension. I don't know what kind of front springs that has, but if they are coils, look for a coil that is not straight and might be hitting some frame metal when it is compressed. You can cure this sometimes by rotating the coil or replacing it. I don't think this has torsion bars, but if so, they pass through frame elements and can make sounds there. The antisway bar is still a possiblility.
The fact that it is not reliably reproducible probably means that it is a combination of steering linkage and suspension. But, it could be suspension alone, since the action of the A arms changes with a wheel in a turn.
Peters is right, this is pretty hard to diagnose from afar. I have found some pretty wierd body squeaks before, but I was right there. A very loud groan is not likely to be a "body squeak."
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Ford ranger chassis problems
They call those joints on the linkage, "rod ends." They could be making noise, but I would not settle for just squirting some grease under the rubber. If they are to the point that they make a growling sound, it is probably time to replace them.
I have personally never had a problem with a rod end failure. We do select HD units for our racing buggys, but I think we use Chevy units on the VW linkage.
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