Ok, so I did NOT attempt this "fix". My son and I were already in the shop installing a E85 sensor kit on his cammed Sierra (my previous truck that he said NEEDED a cam and headers instead of the old-man whisper truck).
But, once done I got underneath mine to inspect and prepare for the job and noticed that the NUT side had "locks" on them similar to the trackbar "wings", but also the shoulders were intentionally rounded to prevent the severe torqueing I was about to give 'em.
That meant I needed to work on the BOLT side. Well, the bolt head was blocked by the rear shock tube on the lower control arm (axle end), and less appealing to get to on the others considering the tire and body.
All during this investigation, I was remembering I'd need some leverage on these things...not just an open end wrench (which for some odd reason I have a 30mm combo wrench that had all kinds of dust on it hanging on the peg wall). I also had a 30mm 1/2" socket, but a 12pt....and that made me much less comfortable doing it.
So...I chickened out. By my figurin', I'd have to remove the shock, then either struggle with the close quarters or put it on the lift, remove both rear wheels, remove both rear shocks, loosen all of the control arm bolts.
Then reinstall the wheels, put the truck on the ground...bounce it for good measure (which I wouldn't want to do on jackstands, BTW), maybe put the truck on jackstands & remove the wheels again. and proceed to crank on these 8 separate SOBs with whatever means necessary for 240 ft-lbs without hurting or killing either of us.
I am of the belief that if those NUTS were able to be loosened from that side....I'd be done. But no. How bad is the annoying vibration...well yesterday it wasn't that bad.
Question for the Off Road lifted guys: Do all aftermarket control arms require the torque and have the special "torsilastic bushing" or similar? I am assuming that these help dampen the vibration that a normal Delrin or other would just transfer and make matters worse.