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What do you mean everything else checks out fine?
Suspension, axles, mounts?
Let me know.
This might seem stupid, but look at the air filter box and make sure the bottom is closed. Sometimes I see where the bottom of the box isn't closed and it will actually do this. I know it sounds silly, but could you look and make sure please?
Ok, if you only knew how many times :)
Ok, has anyone checked the pitching stopper on the back of the engine? This is the mount that goes from the firewall to the engine. If it's loose it might do this to you.
Otherwise we might be looking at a possible front differential issue. I have had a few that made odd sounds when the pinion bearing was failing on the automatics. If so, then you could drain the gear oil in the diff and see if there are any metal flakes in it. Not on the drain plug magnet, but in the oil. When you hold it up to sunlight it will glimmer like glitter.
You're very welcome. Hopefully it's the pitching stopper and not the front diff!
Please let me know if there is any more I can do to help you from here.
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