New control arm installed.
The hardest bit was getting the bolts loose. I soaked them in honey goo + liquid wrench every night for a few days... And then after jacking up the control arm I got my small impact on the bolt and just zipped it back and forth for a few minutes (5 seconds tighten then 5 seconds loosen... Wait... Repeat).
Both bolts were loose in about 5 minutes. Last time I fought with these it took an hour and didn't get much done.
Those newer little electric impacts are awesome.
GMC Sierra 2500hd 2004.5 now with ARP studs