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check the condition of the rear panhard bar & bushings, if the bushings are worn and if the bar "bolts" are not super tight it will make a pop noise, needs to be torqued as tight as you can get it.So follow up on this, I still get a popping noise when turning slowly in and out of the driveway. I believe it is the cross member attach bolts based on other threads/comments about this.
Also had a "clanging" noise when going over bumps at speeds less than 50mph. Found out one of the rear GM sway bar links was defective. You could hit the sway bar at the connection and hear the same clanging noise. Wasn't a loose bolt/nut either. The articulating bolt in the link is loose inside the housing causing the metal to metal contact. So I ordered a pair of Hellwig HEL7961 adjustable end links. Once I get those, no more noise.
See if you can get a photo of that. I'd imagine you can pry them open a bit to get the replacement panhard in. Do you have a caliper you could measure the inside of the brackets compared with the new part? Thinking of swapping all the rear arms and pan hard as well.So I pulled the stock panhard bar to find the body side bushing has leaked all it's grease out. Assume it is filled with grease as the fitting and housing were all caked with dirty grease. The bushing was also free to move around, where as the axle side was still stiff.
So I ordered a QA1 Panhard Bar taking the risk that it would fit, even though it's not listed for my model year (2015+). Looks like hole to hole distance is off by about @ 3/16 inch and the bushing is about an 1/8 inch too wide. I'm not to worried about hole to hole because I can shift the axle to get it to line up unless someone says otherwise.
I tried to slide it into position to see if the holes would line up but it won't even fit into the bathtub brackets. The axle and body side bathtub fittings are too narrow, where as the stock one drops right in. It starts to go in as the fittings have a taper to them. Any thoughts? It would appear any of the aftermarket arms would have this same issue.