This issue is only happening on trucks with the electric assisted steering not on the base hydraulic trucks. If you have to road force below 20 and less than 0.5 oz then the truck is the issue not the assembly.
At 60 psi, the maximum road force is 45 lbs. At 70 psi, the maximum road force is 50 lbs. At 80 psi, the maximum road is 55 lbs. Road force goes up 7 lbs per 10 psi of pressure.
By making cream puff tires, you are just masking the real issue and giving the smooth road shake software more authority to correct the real issue. As the steering system breaks in, the lash will increase and help dampen this out.
I personally would drop the front tire pressure 10 lbs and continue to drive a couple thousand miles until the cal is available.
So riddle me this.....
I'd imagine the reason you don't see it on the base trucks is because they don't have 20" wheels with the same tires. We have not witnessed this on any trucks that don't have the 20" Goodyear Trail Runner tires.
If this issue is on all NV8 (electric assist) trucks then why do none of the trucks with 18" wheels have a problem? I ASSume the steering calibration is the same in both trucks (2020 HD LTZ 4x4 with 18" wheels and 2020 HD LTZ/HC 4x4 with 20" wheels) because the steering gear is the same for 2500/3500 HD crew cab with NV8.
Also if you have a LTZ that came with 18" wheels and no shake, but then you swap wheels/tires from a 20" wheel truck with a shake, why does the original truck shake and the truck that you put the 18" wheels/tires on stop shaking?
Lastly, if the calibration is the fix then why are several people reporting that switching to a different brand of tire immediately fixes the vibration without getting the cal updated?
I understand the steering calibration might help some, but the tires are still crap. A couple of these trucks showed up with over 60 pounds of road force that increased as miles were put on the trucks.
GM should've never went back to Goodyear tires and they should still give people the option to upgrade to Michelin tires when ordering the truck, just like in previous years.
The slight shake of just the steering wheel isn't a huge concern of mine now that we got the ridiculous amount of vibration out of it. Now you can see it on the steering wheel, but you can't feel it. However when my truck (and the other 3 LTZ and High Country's) trucks first came in, the vibration shook the entire truck.
The other interesting thing is that lowering the tire pressure actually makes the shake worse. It's totally opposite of everything the field engineer, brand quality and us thought, but it's true. The PICO levels we obtained on my truck were actually worse when I went from 80 PSI to 65 PSI and they got even worse with a few hundred miles on the new tires. We had road force readings on the 2 tires we replaced go from under 20 pounds when we first mounted them to over 60 pounds in ~600 miles of driving the truck. One of them also developed a "thump" noise when spun up on the road force balancer. The thump noise corresponded perfectly to the area of the tire that had an excessive amount of the internal ribs molded into the tire. Even worse is that one of the tires was on the rear and the steering cal won't do a damn thing for a vibration from a rear tire.
I'm not trying to argue, but we've been dealing with this for several weeks and ~30 hours worth of labor so what we've seen (and documented) is slightly different than what engineering, TAC and the "subject matter experts" have been saying.