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Thank you for getting back to me. I purchased a few feet of the rubber strips you mentioned above, so hopefully that fixes the issues. I will report back after the rubber strips arrive and I get them installed.Hi thanks for your patience, being our busiest time of the year we are running a day or two longer on getting back to emails. Calling us always best because we can usually help you out right away.
This sounds like an issue caused by flexing of the vehicles frame rather than the skid plates themselves. I've never personally experienced this, but the skid plates tie all of the frame and cross-members together so when the chassis moves the skid plates naturally will have to flex as well, which can cause popping noises. My advice would be to take the plates off and install thin rubber strips (1/8" +/-) between all metal surfaces that contact each other. This should hopefully cure your problem.
As for the A-arms, there is literally no way they would be making any noise provided they are bolted down tightly and not contacting anything within the suspension travel.
Thanks and hope this helps you!